Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh via » hanh vi, hanh va, anh va
cam luc » cam xuc, cau luc
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((((hieu va) OR (hieu qua))) or (lieu va)) cam luc va hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang xa hoi. ((((hieu va) OR (hieu qua))) OR (lieu va)) cam luc va hanh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach v nang xa hoi. ((((hieu va) OR (hieu qua))) or (lieu va)) cam luc va hanh via cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang xa hoi. ((((hieu va) OR (hieu qua))) or (lieu va)) cam luc va hanh via cua tre*.