Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
thac toc » cac toc, thac cac, thi toc
lai cua » dai cua, hai cua, lai chau
hac tuc » thai tuc
su sach » so sach, vu sach
xay hoi » xa hoi, tay hoi, cay phoi
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty dang) OR (ty hang)) xay hoi. hieu van ((hac tuc) or (thac toc)) gia thanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty dang) OR (ty hang)) xay hoi. hieu van ((hac tuc) OR (thac toc)) gia thanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty dang) OR (ty hang)) xay hoi. hieu van ((hac tuc) or (thac toc)) gia thanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) OR (ty hang)) xay hoi. hieu van ((hac tuc) or (thac toc)) gia thanh lai cua te*.