Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
ho chieu » hoc thieu, doi chieu, mot chieu
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
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: ((theo chieu) OR (ho chieu)) xanh - canh tranh ((cua dung) or (qua dung)) cong tan chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - canh tranh ((cua dung) OR (qua dung)) cong tan chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) xanh - canh tranh ((cua dung) or (qua dung)) cong tan chan tu".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) xanh - canh tranh ((cua dung) or (qua dung)) cong tan chan tu*.