Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
duong cao » duong co, duong dao, luong cao
dung cong » dung trong
tan thanh » tran thanh, tang thanh, toan thanh
thanh lap » thanh san, phan lap, thanh hai
dung cao » dung cho, dung co, dung cac
cong tan » cong tac, cong san, cong thanh

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 (trieu tinh)) - hanh ((dung cao) OR (duong cao)) dung cong tan thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (trieu tinh)) - hanh ((dung cao) OR (duong cao)) dung cong tan thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (trieu tinh)) - hanh ((dung cao) OR (duong cao)) dung cong tan thanh lap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (trieu tinh)) - hanh ((dung cao) OR (duong cao)) dung cong tan thanh lap*.