Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, hanh trang
khang cong » hang cong, thanh cong, dang cong
thang van » tang van, thanh van, thong van
van khang » van khanh, van thanh, van quang
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban
so lieu » so dieu
co lieu » cot lieu, co hieu, cu lieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so lieu) OR (co lieu)) tinh - nhanh thang van khang cong tan ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so lieu) or (co lieu)) tinh - nhanh thang van khang cong tan ((toan cao) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((so lieu) or (co lieu)) tinh - nhanh thang van khang cong tan ((toan cao) OR (toan ban))*.