Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
khoan cam » khoa cam, khoan va, phan cam
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong van » cong vang, cong san, song van
than cap » khan cap, thanh lap, thanh cac

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 tang cua dung cong van ((than cap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh tang cua dung cong van ((than cap) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh tang cua dung cong van ((than cap) or (khoan cam))*.