Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
manh tung » manh hung, thanh tung
tung tuan » trung tuan, hung tuan, quang tuan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
vang toan » van toan, dang toan, quang toan
chi sach » chinh sach, chieu sach, co sach
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi sach) or (cuon sach)) - manh tung tuan ((hang cong) OR (bang cong)) vang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sach) OR (cuon sach)) - manh tung tuan ((hang cong) OR (bang cong)) vang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi sach) or (cuon sach)) - manh tung tuan ((hang cong) OR (bang cong)) vang toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) or (cuon sach)) - manh tung tuan ((hang cong) OR (bang cong)) vang toan cao*.