Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
anh trong » anh thuong, dinh trong, lang trong
trong qua » trong quan, thong qua, trong nha
qua dung » quang dung, su dung, qua song
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
toan ban » van ban

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 trong qua dung ((cong san) or (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh trong qua dung ((cong san) OR (cong tan)) toan ban*.