Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
tuc va » thuc va, tuc xa, thuc vat
va cua » va chua, via cua, ca cua
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: su sach ty nang xa hoi. hieu van nam ((((tuc va) OR (duc va))) OR (truc va)) hang va cua te~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van nam ((((tuc va) or (duc va))) or (truc va)) hang va cua te*.