Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
trung va » truong va, trang va, trung ha
tran van » luan van
cong van » cong vang, cong san, song van
van tang » van thang, van trang, van nang
tang ca » tang cua, hang ca, tang ma

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 (thien thanh)) - thanh ((trung va) or (tran van)) nhung cong van tang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien thanh)) - thanh ((trung va) OR (tran van)) nhung cong van tang ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien thanh)) - thanh ((trung va) or (tran van)) nhung cong van tang ca*.