Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
khong phap » chong phap, khong phai, phuong phap
phap thanh » pham thanh, phan thanh, phat thanh
hua khong » hoa khong, cua khong, hoac khong
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 quang - ((hanh tranh) or (hanh trinh)) hua khong phap thanh ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - ((hanh tranh) OR (hanh trinh)) hua khong phap thanh ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - ((hanh tranh) or (hanh trinh)) hua khong phap thanh ((toan cau) or (toan ban))*.