Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhanh mang » nhanh lang, nhanh quang, nhanh thang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » hanh trang, nhanh lang, thanh hang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
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)) - ((hanh mang) OR (nhanh mang)) va dung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu nganh) OR (hieu lang)) - ((hanh mang) OR (nhanh mang)) va dung cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu nganh) or (hieu lang)) - ((hanh mang) OR (nhanh mang)) va dung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu nganh) or (hieu lang)) - ((hanh mang) OR (nhanh mang)) va dung cong tan toan cao*.