Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sach » chinh sach, chieu sang, chieu xanh
tranh cua » doanh cua, manh cua
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
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: theo ((chieu sach) OR (chiet tach)) - hanh ((trung thanh) or (tranh cua)) dung cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - hanh ((trung thanh) OR (tranh cua)) dung cong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chiet tach)) - hanh ((trung thanh) or (tranh cua)) dung cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - hanh ((trung thanh) or (tranh cua)) dung cong manh toan cao*.