Perhaps you should try some spelling variations:
thanh trung » thanh tung
tien manh » tien anh, tien thanh, tieng anh
hieu manh » chieu xanh, hieu nganh, dieu hanh
bang cong » dang cong, bang song, hang cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
va bang » va nang, va lang, va 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 ((tien manh) or (hieu manh)) - ((canh tranh) or (thanh trung)) va bang cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (hieu manh)) - ((canh tranh) OR (thanh trung)) va bang cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (hieu manh)) - ((canh tranh) or (thanh trung)) va bang cong tac toan cao*.