Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
ly nang » ky nang, ly hang, ly quang
ly vang » ly hang, ly van, ly quang
mai hoi » mai khoi, dai hoi, lai hoi
duoc ma » duoc lam
ma hanh » va hanh, da hanh, na hanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ly nang) or (ly vang)) mai hoi. hieu van nam duoc ma hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly nang) OR (ly vang)) mai hoi. hieu van nam duoc ma hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly nang) or (ly vang)) mai hoi. hieu van nam duoc ma hanh va cua tre*.