Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh phan » thanh pho, thanh san, thanh toan
tan thanh » tran thanh, tang thanh, toan thanh
cong cap » cung cap, cong cau, cong cac
han cong » phan cong, hang cong, hanh cong
cong tan » cong tac, cong san, cong thanh
hieu ca » hieu cac, hieu cua, hieu va
cap han » cap phan, cap can, cap hay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu ca) OR (chieu sach)) - thanh cong cap han cong tan thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu ca) OR (chieu sach)) - thanh cong cap han cong tan thanh phan*".