Perhaps you should try some spelling variations:
tban tieng » toan tieng, toan tien, tap tieng
trung cong » truong cong, trong cong, trung uong
hien xanh » hien hanh, hien nhanh, chieu xanh
ban tieng » van tien, ban tinh, va tieng
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - ((tban tieng) or (ban tieng)) viet trung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((tban tieng) OR (ban tieng)) viet trung cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((tban tieng) or (ban tieng)) viet trung cong dan van ban*.