Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
hoc thieu » hoc hien
tac thong » tac thuong, tac trong, tac chong
thong van » trong van, thong va, thong quan
cong tac » cong ty
van dang » van dong, van dung, van nang
dang ca » dang cac, dan ca, hang ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (hoc thieu)) tinh - tranh cong tac thong thong van dang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (hoc thieu)) tinh - tranh cong tac thong thong van dang ca.
• Adding a wildcard symbol may retrieve word variants: ((toc thieu) or (hoc thieu)) tinh - tranh cong tac thong thong van dang ca*.