Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
quang chat » quang chan, quang phat, quang cua
trinh van » trinh han, trinh quan, trinh toan
van nhung » van nhuong, va nhung, van hung
quang cao » nang cao, quang nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (nhieu tang)) - canh trinh van nhung cong ((quang chat) OR (quang cao)) va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhieu tang)) - canh trinh van nhung cong ((quang chat) OR (quang cao)) va.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (nhieu tang)) - canh trinh van nhung cong ((quang chat) OR (quang cao)) va".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhieu tang)) - canh trinh van nhung cong ((quang chat) OR (quang cao)) va*.