Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
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 nhung cong tan 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 nhung cong tan chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc hien)) xanh - ((canh trinh) OR (canh tinh)) va nhung cong tan chan tu".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc hien)) xanh - ((canh trinh) OR (canh tinh)) va nhung cong tan chan tu*.