Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
than phan » thanh phan, toan phan, thanh pham
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
than ma » than man, than va, khan ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu sach)) - canh tranh va nhung cong tan ((than phan) or (than ma))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu sach)) - canh tranh va nhung cong tan ((than phan) OR (than ma)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sach)) - canh tranh va nhung cong tan ((than phan) or (than ma))*.