Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nhung cong » dung cong, thong cong, hang cong
cong luong » cong thuong, nang luong, cong dong
luong toan » luong thanh, truong toan, luong tai
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
toan cao » toan ban, toan tap

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 (chieu sang)) - thanh ((trung va) or (trung ha)) nhung cong luong toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu sang)) - thanh ((trung va) OR (trung ha)) nhung cong luong toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - thanh ((trung va) or (trung ha)) nhung cong luong toan cao*".