Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
sach ky » sach y, sach ty, sach kem
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua su » qua su

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 ky) or (sac ky)) nang xa hoi. hieu van cac ((luc va) or (thuc va)) hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van cac ((luc va) OR (thuc va)) hanh vi cua su.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang xa hoi. hieu van cac ((luc va) or (thuc va)) hanh vi cua su*.