Perhaps you should try some spelling variations:
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
theo ha » theo phap, theo chu, thep nha
ha tinh » va tinh, may tinh
va dung » van dung, va duong, vat dung
tac van » tac vang, cac van, tac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ha tinh - ((anh tang) or (hanh mang)) va dung cong tac van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ha tinh - ((anh tang) OR (hanh mang)) va dung cong tac van ban*.