Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu van cac ((tuc va) or (thuc vat)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cac ((tuc va) OR (thuc vat)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cac ((tuc va) or (thuc vat)) hanh vi luu tre*.