Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cong bang » cuong bang, dong bang, hong bang
tranh he » trinh he, tranh ha, tinh he
he nhung » hee nhung, ve nhung, me nhung
cong ban » cong san, cong tan, cong dan
han tai » hang tai, nhan tai, van tai

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 (chieu sang)) - canh tranh he nhung ((cong ban) or (cong bang)) han tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - canh tranh he nhung ((cong ban) OR (cong bang)) han tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - canh tranh he nhung ((cong ban) or (cong bang)) han tai".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - canh tranh he nhung ((cong ban) or (cong bang)) han tai*.