Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
kinh cuu » dinh cuu, vinh cuu, kinh suu
su sach » so sach, vu sach
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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) or (v nang)) x hoi. hieu van lam ((thuc va) or (tuc xa)) than kinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) x hoi. hieu van lam ((thuc va) OR (tuc xa)) than kinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) x hoi. hieu van lam ((thuc va) or (tuc xa)) than kinh cuu tre*.