Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hang vai » hang tai, hang hai, hang vi
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. lieu va cac duc tan ((hang vai) or (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ma hoi. lieu va cac duc tan ((hang vai) OR (hang va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ma hoi. lieu va cac duc tan ((hang vai) or (hang va)) cua tre*.