Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
hanh va » hang va, hanh vi
su viet » so viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

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