Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
tranh chap » tranh cua, trinh chat
trang cap » trung cap, trong cap, trang cham
dung cong » dung trong
dien dan » hien dai, vien dai, gian dan
cong tac » cong ty
tac vang » cac van, tac dung, tac dong
vang ban » van ban, hang ban, nang ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: duc ((tien thanh) or (dien dan)) - hanh ((trang cap) OR (tranh chap)) dung cong tac vang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: duc ((tien thanh) OR (dien dan)) - hanh ((trang cap) OR (tranh chap)) dung cong tac vang ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "duc ((tien thanh) or (dien dan)) - hanh ((trang cap) OR (tranh chap)) dung cong tac vang ban".
• Adding a wildcard symbol may retrieve word variants: duc ((tien thanh) or (dien dan)) - hanh ((trang cap) OR (tranh chap)) dung cong tac vang ban*.