Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
truc va » thuc vat, trung va
va cua » va chua, via cua, ca cua
cua te » cua tu
xuc va » duc va, tuc va, luc va

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 ((xuc va) OR (((truc va) OR (thuc va)))) hanh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu van nam ((xuc va) or (((truc va) OR (thuc va)))) hanh va cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van nam ((xuc va) or (((truc va) OR (thuc va)))) hanh va cua te*.