Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
chieu sach » chinh sach, chiet tach, chieu sang
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
tan thanh » tran thanh, tang thanh, toan thanh
cong tan » cong tac, cong san, cong thanh
va dung » van dung, va duong, vat dung

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 qua) OR (chieu sach)) - hanh hang va dung cong tan thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu qua) OR (chieu sach)) - hanh hang va dung cong tan thanh phan*".