Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
anh bang » anh hoang, anh quang, tinh bang
va trong » va truong, va thong, va tuong
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban
bang va » hang va, ban va, trang va

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 - anh bang va trong cong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh bang va trong cong tan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh bang va trong cong tan ((toan cao) or (toan ban))*.