Perhaps you should try some spelling variations:
hoc trong » hoc thuong, hoc tieng, dot trong
hoa khong » khoi khong, hoa cong, he khong
cong danh » cuong danh, cong dan, cong thanh
danh toan » manh toan, anh toan, dan toan
toan cao » toan ban, toan tap
ho bien » pho bien, hoa bien, bo bien
so bien » mot bien

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho bien) OR (so bien)) tinh - canh tranh ((hoc trong) or (hoa khong)) cong danh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho bien) OR (so bien)) tinh - canh tranh ((hoc trong) OR (hoa khong)) cong danh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho bien) OR (so bien)) tinh - canh tranh ((hoc trong) or (hoa khong)) cong danh toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho bien) OR (so bien)) tinh - canh tranh ((hoc trong) or (hoa khong)) cong danh toan cao*.