Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, thi chieu
tranh cua » doanh cua, manh cua
khoan dau » khoan danh, phan dau, khoan va
theo chu » cho chu, chao chu, theo yeu
cua dung » cua dang, cua dong, qua dung
cong may » cong ma, cong hay, cong my
cong xay » thong xay, trong xay, cong ty

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 (theo chu)) sang - canh tranh cua dung ((cong may) or (cong xay)) khoan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) sang - canh tranh cua dung ((cong may) OR (cong xay)) khoan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo chu)) sang - canh tranh cua dung ((cong may) or (cong xay)) khoan dau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo chu)) sang - canh tranh cua dung ((cong may) or (cong xay)) khoan dau*.