Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
chinh cua » chinh ca, chinh sua, hinh cua
ban cong » bang cong, van cong, phan cong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, than cap, than vao
than sao » than so, than vao, thanh san
thai cao » tai cao, thoai cac, thuat cao

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