Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
thang va » hang va, trang va, thong va
cong san » cong tac
tang va » trang va, tang van, tang vat
san tai » sang tai, van tai, han tai
tai cao » thai cao, tao cao, tai sao

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