Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
truong va » truong dai, truong cao, truong dao
trong van » trong cac
nang cong » nang song, dang cong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - thanh ((truong va) or (trong van)) nang cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((truong va) OR (trong van)) nang cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((truong va) or (trong van)) nang cong tac toan tap*.