Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh hang » thanh hang, hang hang, hanh han
dang cong » dung cong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan che » han che, phap che, phan thi
hieu ca » hieu cac, hieu cua, hieu va
va dang » van dang, va nang, va lang

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