Perhaps you should try some spelling variations:
"so sach trinh le cua cong" » "so sach tranh le cua cong", "so hanh trinh le cua cong", "so sach tren le cua cong", "so sach trinh ly cua cong", "so sach thinh le cua cong", "so sach trinh he cua cong", "so sanh trinh le cua cong", "bo sach trinh le cua cong", "co sach trinh le cua cong"
"so hoach dinh te cua cong" » "so hoang dinh te cua cong", "so hoa dinh te cua cong", "so hoc dinh te cua cong", "so hoach kinh te cua cong", "so hoach dich te cua cong", "so hoach dinh ve cua cong", "so hoach dinh tue cua cong", "so hoach dinh de cua cong"
"ke hoach dinh te cua cong" » "ke hoang dinh te cua cong", "ke hoach kinh te cua cong", "ke hoach dich te cua cong", "ke hoach dinh ve cua cong", "ke hoach dinh tue cua cong", "ke hoach dinh de cua cong"
"so sach minh ve cua cong" » "so sach danh ve cua cong", "so sac tinh ve cua cong", "so cach kinh ve cua cong", "so sanh minh ve cua cong", "bo sach minh ve cua cong", "co sach minh ve cua cong", "so sach dinh ve cua cong", "so sach minh va cua cong", "so sach trinh ve cua cong", "so sach minh de cua cong", "so sach minh ve cum cong", "so sach minh ve chuan cong"
"so sach kinh ve cua cong" » "so sanh kinh ve cua cong", "bo sach kinh ve cua cong", "co sach kinh ve cua cong", "so sach kinh te cua cong", "so sach dinh ve cua cong", "so sach kinh viet cua cong", "so sach kinh de cua cong", "so sach kinh ve cum cong", "so sach kinh ve chuan cong"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("so sach kinh ve cua cong") or ("so sach trinh le cua cong"))) or ((("so sach minh ve cua cong") or ((("so hoach dinh te cua cong") OR ("ke hoach dinh te cua cong"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("so sach kinh ve cua cong") OR ("so sach trinh le cua cong"))) OR ((("so sach minh ve cua cong") OR ((("so hoach dinh te cua cong") OR ("ke hoach dinh te cua cong"))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"so sach kinh ve cua cong\") or (\"so sach trinh le cua cong\"))) or (((\"so sach minh ve cua cong\") or (((\"so hoach dinh te cua cong\") OR (\"ke hoach dinh te cua cong\"))))))*".
• Removing quotes may allow a broader search: (((( so sach kinh ve cua cong ) or ( so sach trinh le cua cong ))) or ((( so sach minh ve cua cong ) or ((( so hoach dinh te cua cong ) OR ( ke hoach dinh te cua cong ))))))*.