Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
va dung » van dung, va duong, vat dung
chan tu » phan tu, han tu, chon tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc hien)) xanh - ((canh trinh) or (canh tinh)) va dung cong tac chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc hien)) xanh - ((canh trinh) OR (canh tinh)) va dung cong tac chan tu.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc hien)) xanh - ((canh trinh) or (canh tinh)) va dung cong tac chan tu*.