Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
tan gian » tran gian, dan gian, van gian
gian cao » gian cac, gian co, giai cao
tung va » trung va, tuong va, dung va

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