Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, canh tranh, cach mang
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
ho chieu » theo chieu, doi chieu, mot chieu
manh cua » doanh cua, ban cua
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: ((ho chieu) or (hoc thieu)) xanh - canh manh cua ((hang cong) OR (hang nong)) tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh manh cua ((hang cong) OR (hang nong)) tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh manh cua ((hang cong) OR (hang nong)) tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh manh cua ((hang cong) OR (hang nong)) tac toan cao*.