Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
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: hoc hieu lang - hanh trung ((cua thong) OR (cua khong)) cong tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trung ((cua thong) OR (cua khong)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trung ((cua thong) OR (cua khong)) cong tac toan cao*.