Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
vuc nang » cuc nang, vu nang, chuc nang
hang vai » hang va, hang tai, hang hai
sach vuc » sach duoc, sach nuoc, sach truc
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, dua ban, duc man
nang xa » nang x, lang xa, nang ma
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: thu sach vuc nang xa hoi. ((lieu va) or (thien van)) lam ((duc ban) or (duc van)) hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach vuc nang xa hoi. ((lieu va) OR (thien van)) lam ((duc ban) OR (duc van)) hang vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach vuc nang xa hoi. ((lieu va) or (thien van)) lam ((duc ban) or (duc van)) hang vai cua tre*.