Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tac » cong ty
toan cao » toan ban
toan tap » toan ban
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: ((ho chieu) OR (doi chieu)) sang - hanh mang va dung cong tac ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sang - hanh mang va dung cong tac ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sang - hanh mang va dung cong tac ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sang - hanh mang va dung cong tac ((toan cao) or (toan tap))*.