Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
qua trong » quan trong, qua trinh, qua song
hoc hieu » hoc thieu, hoc hien, doc hieu
ca trong » cay trong, cad trong, co trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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: hoc hieu manh - canh tranh ((ca trong) or (qua trong)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh ((ca trong) OR (qua trong)) cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh ((ca trong) or (qua trong)) cong san toan cau*.