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
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
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) OR (mang 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) OR (mang cua)) dung cong van ((than cap) OR (khoan cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - anh ((tang cua) OR (mang cua)) dung cong van ((than cap) or (khoan cam))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh ((tang cua) OR (mang cua)) dung cong van ((than cap) or (khoan cam))*.