Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac
va hanh » va thanh, va danh, ban hanh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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