Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
lieu tinh » trieu tinh, diep tinh, bien tinh
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » 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: toc ((chieu sach) or (lieu tinh)) - thanh trung ((cua ban) or (cua nhung)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((chieu sach) OR (lieu tinh)) - thanh trung ((cua ban) OR (cua nhung)) cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: toc ((chieu sach) or (lieu tinh)) - thanh trung ((cua ban) or (cua nhung)) cong tan toan cau*.