Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
dai cuu » dai cua, dai huu
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cac, va cam, ve cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (hoc sach)) ky nang ma hoi. hieu ((ve cam) or (ve cham)) duc va hanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang ma hoi. hieu ((ve cam) OR (ve cham)) duc va hanh dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang ma hoi. hieu ((ve cam) or (ve cham)) duc va hanh dai cuu tre*.