Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
cua dung » cua dang, cua dong, qua dung
cong van » cong vang, cong san, song van
tuan cap » thuan cam, toan cao, toan cau
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) or (anh dang)) cua dung cong van ((tuan cap) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((anh tang) OR (anh dang)) cua dung cong van ((tuan cap) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((anh tang) or (anh dang)) cua dung cong van ((tuan cap) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((anh tang) or (anh dang)) cua dung cong van ((tuan cap) OR (than cap))*.