Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
ban quan » van quan
manh cua » doanh cua, ban cua
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
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 - hanh ((ban quan) or (manh cua)) thong cong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((ban quan) OR (manh cua)) thong cong van toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((ban quan) or (manh cua)) thong cong van toan ban*.