Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
ty hang » ly hang, ty xang, thi hang
kinh va » kinh van, tinh va, sinh va
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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 ((ky nang) or (ty hang)) xa hoi. lieu va cam ((xuc va) OR (luc va)) kinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky nang) OR (ty hang)) xa hoi. lieu va cam ((xuc va) OR (luc va)) kinh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky nang) or (ty hang)) xa hoi. lieu va cam ((xuc va) OR (luc va)) kinh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky nang) or (ty hang)) xa hoi. lieu va cam ((xuc va) OR (luc va)) kinh va cuu tre*.