Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu nganh » vien nganh, hiem ngan, hieu manh
hieu lang » chieu sang, nhieu tang, hieu van
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
mang va » mang vua, hang va, bang va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu nganh) or (((hieu lang) OR (hieu quang)))) - hanh mang va dung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu nganh) OR (((hieu lang) OR (hieu quang)))) - hanh mang va dung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu nganh) or (((hieu lang) OR (hieu quang)))) - hanh mang va dung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu nganh) or (((hieu lang) OR (hieu quang)))) - hanh mang va dung cong tan toan cau*.