Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
cay phoi » cap phoi, tay hoi, cay cho
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, gay thoi
ky dang » ky nang, ky danh
te sach » toc sach
luc va » duc va, tuc va, loc va

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) or (te sach)) ky dang ((xay hoi) OR (cay phoi)). thien van cau luc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky dang ((xay hoi) OR (cay phoi)). thien van cau luc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky dang ((xay hoi) OR (cay phoi)). thien van cau luc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky dang ((xay hoi) OR (cay phoi)). thien van cau luc va hanh dai cua tre*.