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

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