Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va nham » va tham, va nha, va kham
va cham » va chat, va tham
va dinh » van dinh, va kinh, va tinh
thu va » thuc va, thue va, tu va
di cua » doi cua, de cua, do cua

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. lieu ((va nham) OR (va cham)) thu va dinh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. lieu ((va nham) OR (va cham)) thu va dinh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. lieu ((va nham) OR (va cham)) thu va dinh ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. lieu ((va nham) OR (va cham)) thu va dinh ((di cua) or (dai cua)) tre*.