Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
lieu tinh » trieu tinh, diep tinh, bien tinh
manh tung » manh hung, thanh tung
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((lieu tinh) or (chieu sach)) - manh tung va ((nang cong) or (dang cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((lieu tinh) OR (chieu sach)) - manh tung va ((nang cong) OR (dang cong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((lieu tinh) or (chieu sach)) - manh tung va ((nang cong) or (dang cong)) van toan cao*.