Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va
loc va » hoc va
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: tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cam ((luc va) or (loc va)) hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((hieu ve) OR (hieu va)) cam ((luc va) OR (loc va)) hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cam ((luc va) or (loc va)) hanh va su triet*.