Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhiet nang » nhiet dong, viet nang, nhieu tang
thong cong » trong cong, tong cong, thong thong
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than man » than ma, thanh san, tran manh

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)) thong cong ban than man~.
• 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)) thong cong ban than man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhiet nang)) - hanh ((trung cua) OR (trung cap)) thong cong ban than man".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhiet nang)) - hanh ((trung cua) OR (trung cap)) thong cong ban than man*.