Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
tran thanh » ban thanh, van thanh
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 ((tran thanh) OR (quan thanh)) nhung cong van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((tran thanh) OR (quan thanh)) nhung cong van toan cao*".