Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
thanh dat » thanh san, thanh hai, thanh van
hoc sach » hoc sinh, hoc cac, hoc anh
cam truc » cau truc, nam truc, lam truoc
va thanh » gia thanh, ban thanh, va tinh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v 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) or (thuoc sach)) y nang ((xa hoi) or (mai hoi)). hieu va cam truc va thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (thuoc sach)) y nang ((xa hoi) OR (mai hoi)). hieu va cam truc va thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (thuoc sach)) y nang ((xa hoi) or (mai hoi)). hieu va cam truc va thanh dat cua tre*.