Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu xanh » tieu danh, chieu xanh, dieu hanh
tang van » dang van, hoang van, trong van
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
tang va » trang va, thang va, tang vat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - hanh ((tang va) OR (tang van)) nhung cong van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh ((tang va) OR (tang van)) nhung cong van toan cao*".