Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham xuc » cam xuc, chat xuc, cham soc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xuc may » xuc hay, truc may, phuc may
vai cua » hai cua, lai cua, bai 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 ((van xay) or (nang x)) hoi. hieu va cham xuc may tinh ((vai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((van xay) OR (nang x)) hoi. hieu va cham xuc may tinh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((van xay) or (nang x)) hoi. hieu va cham xuc may tinh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((van xay) or (nang x)) hoi. hieu va cham xuc may tinh ((vai cua) OR (dai cua)) tre*.