Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
hanh dan » thanh dan, hanh san, canh dan
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
ca dung » cao dung, cap dung, cu 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 ca) or (chieu sach)) - hanh dan ca dung cong tan phan che~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu ca) OR (chieu sach)) - hanh dan ca dung cong tan phan che*.