Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
quang tran » quang tuan, quang trung, quang thanh
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran hong, tran quang, tran hoang
hung dung » nhung dung, phung dung, ung dung
tai toan » bai toan, tap toan, tam toan
tai tuan » tri tuan, ta tuan, tai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (nhieu tang)) - anh quang tran hung dung ((tai toan) OR (tai tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (nhieu tang)) - anh quang tran hung dung ((tai toan) OR (tai tuan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (nhieu tang)) - anh quang tran hung dung ((tai toan) OR (tai tuan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (nhieu tang)) - anh quang tran hung dung ((tai toan) OR (tai tuan)) cau*.