Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhiet nang » nhiet dong, viet nang, nhieu tang
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
tong cong » trong cong, cong cong, dung cong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
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 ((chieu sach) or (nhiet nang)) - hanh ((trung cua) or (trung cap)) tong cong ban than ma~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhiet nang)) - hanh ((trung cua) OR (trung cap)) tong cong ban than ma.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhiet nang)) - hanh ((trung cua) or (trung cap)) tong cong ban than ma*.