Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
thanh lap » thanh san, phan lap, thanh hai
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
khan cap » khan ap, than cap, khoan cam
than va » thanh va, nhan va, toan 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 tang cua dung cong van ((((than va) or (thanh lap))) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh tang cua dung cong van ((((than va) OR (thanh lap))) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh tang cua dung cong van ((((than va) or (thanh lap))) or (khan cap))*.