Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va gianh » va gian, van giang, va giai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
lan cua » lang cua, ban cua, dan cua
lai cua » dai cua, hai cua, lai chau
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 ky nang xa hoi. ((hieu va) or (lieu va)) cac xuc va gianh ((lan cua) OR (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. ((hieu va) OR (lieu va)) cac xuc va gianh ((lan cua) OR (lai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. ((hieu va) or (lieu va)) cac xuc va gianh ((lan cua) OR (lai cua)) te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. ((hieu va) or (lieu va)) cac xuc va gianh ((lan cua) OR (lai cua)) te*.