Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cay cho » cap cho, cao cho, cay co
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan da » dan dat, dan ca, dan va
da cua » dai cua, day cua, dan 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 dang ((xay hoi) or (cay cho)). ((hieu ve) or (lieu va)) cam xuc va dan da cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang ((xay hoi) OR (cay cho)). ((hieu ve) OR (lieu va)) cam xuc va dan da cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang ((xay hoi) or (cay cho)). ((hieu ve) or (lieu va)) cam xuc va dan da cua tre*.