Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
chinh cua » chinh ca, chinh sua, hinh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
cong tan » cong tac, cong san, cong thanh
toan ban » van ban
han tai » hang tai, nhan tai, van tai

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 - hanh chinh cua hang cong tan ((han tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh chinh cua hang cong tan ((han tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh chinh cua hang cong tan ((han tai) or (toan ban))*.