Perhaps you should try some spelling variations:
thong chuan » trong chuan, thong chuyen, thong chuong
thong chuon » thong chuong, thong thuong, thong chuyen
theo chieu » theo tieu, theo chu, thi chieu
bang cong » dang cong, bang song, hang cong
ho chieu » hoc thieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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 - manh ((thong chuon) OR (thong chuan)) bang cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - manh ((thong chuon) OR (thong chuan)) bang cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) xanh - manh ((thong chuon) OR (thong chuan)) bang cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - manh ((thong chuon) OR (thong chuan)) bang cong tac toan cao*.