Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di cua
loc va » luc va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cam ((loc va) OR (hoc va)) danh vi cua te~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu ve) or (hieu va)) cam ((loc va) or (hoc va)) danh vi cua te*.