Perhaps you should try some spelling variations:
khong dung » thong dung, phuong dung, cuong dung
hanh trinh » canh tranh, hanh chinh
vien canh » bien canh, vien can, vien nganh
trinh hua » trinh hoa, trinh cua, trinh ha
hua khong » hoa khong, cua khong, hoac khong
hoc vien » hoc hien, hoc viet, hoc tieng
tan toan » tan tran, tap toan, van toan
bai toan » bai 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 vien canh - hanh trinh hua khong dung ((tan toan) or (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc vien canh - hanh trinh hua khong dung ((tan toan) OR (bai toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc vien canh - hanh trinh hua khong dung ((tan toan) or (bai toan)) cao*.