Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
sach ty » sach tu, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
duc ban » duc van, dua ban, duc man
lai cua » dai cua, hai cua, lai chau
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 y) or (sach ty)) lang xa hoi. hieu van cam ((duc ban) or (duc tan)) thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sach ty)) lang xa hoi. hieu van cam ((duc ban) OR (duc tan)) thanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sach ty)) lang xa hoi. hieu van cam ((duc ban) or (duc tan)) thanh lai cua tre*.