Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao
cua te » cua tu
cua su » qua su

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 nang ((mai hoi) or (lai hoi)). lieu va cam xuc van hanh tai ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ((mai hoi) OR (lai hoi)). lieu va cam xuc van hanh tai ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ((mai hoi) or (lai hoi)). lieu va cam xuc van hanh tai ((cua te) or (cua su))*.