Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
xuc van » duc van, luc van, vuc van
cao xuc » cam xuc, cao duc, cao suc
sang ky » sang kyo, dang ky, tang ky
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
dan ky » van ky
doi su » oi su, voi su
don su » dong su, down su, dan su
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sang ky) or (dan ky)) dang xay hoi. hieu va cao xuc van hanh ((doi su) OR (don su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sang ky) OR (dan ky)) dang xay hoi. hieu va cao xuc van hanh ((doi su) OR (don su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sang ky) or (dan ky)) dang xay hoi. hieu va cao xuc van hanh ((doi su) OR (don su)) triet*".