Perhaps you should try some spelling variations:
hoc viet » hoc hien
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
hanh va » hanh vi
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
su sai » su tai, su hai, su dai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky tang xa hoi. ((hieu ve) or (hieu va)) cam tuc van ((hanh va) OR (hang va)) hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang xa hoi. ((hieu ve) OR (hieu va)) cam tuc van ((hanh va) OR (hang va)) hoc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky tang xa hoi. ((hieu ve) or (hieu va)) cam tuc van ((hanh va) OR (hang va)) hoc viet".
• Adding a wildcard symbol may retrieve word variants: su sai ky tang xa hoi. ((hieu ve) or (hieu va)) cam tuc van ((hanh va) OR (hang va)) hoc viet*.