Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trang va » tran van, hang va
cong van » cong vang, cong san, song van
tang va » tang van, thang va, tang vat
van tai » von tai, van tuan
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 (hieu lang)) - anh ((tang va) OR (trang va)) nhung cong van tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu lang)) - anh ((tang va) OR (trang va)) nhung cong van tai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (hieu lang)) - anh ((tang va) OR (trang va)) nhung cong van tai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu lang)) - anh ((tang va) OR (trang va)) nhung cong van tai cao*.