Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cong van » cong vang, cong san, song van
cong tac » cong ty
toan cao » toan ban, toan tap
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - ((thanh trung) OR (thanh tung)) va lang ((cong van) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((thanh trung) OR (thanh tung)) va lang ((cong van) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((thanh trung) OR (thanh tung)) va lang ((cong van) or (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh trung) OR (thanh tung)) va lang ((cong van) or (cong tac)) toan cao*.