Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
su viet » so viet
xay hoi » tay hoi, cay phoi, gay thoi
san ky » sang ky, van ky, ban ky
va cam » va cham, va cac, va cao
dan ky » van ky
doi su » oi su, don su, voi su

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

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