Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
van cam » van nam, van lam, van cau
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
ty nang » ky nang, ty xang, ly nang
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ty nang) or (((ty hang) OR (ly hang)))) xa hoi. hieu van cam xuc va tinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty nang) OR (((ty hang) OR (ly hang)))) xa hoi. hieu van cam xuc va tinh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ty nang) or (((ty hang) OR (ly hang)))) xa hoi. hieu van cam xuc va tinh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty nang) or (((ty hang) OR (ly hang)))) xa hoi. hieu van cam xuc va tinh va cuu tre*.