Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
phan hieu » van hieu, phan kien, gian hieu
hieu lang » chieu sang, hieu quang, nhieu tang
cong tinh » cong trinh, cong vinh, long tinh
tran van » luan van
toan tap » toan ban
tran va » trang va, tranh va, toan va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: phan hieu lang - thanh ((tran va) or (tran van)) nhung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phan hieu lang - thanh ((tran va) OR (tran van)) nhung cong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: phan hieu lang - thanh ((tran va) or (tran van)) nhung cong tinh toan tap*.