Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va hanh » van hanh, va danh, ban hanh
tai cua » thai cua, tai cuc, tri cua
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) or (toc sach)) ky dang xa hoi. thien van nam thuc ((va hanh) OR (va thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky dang xa hoi. thien van nam thuc ((va hanh) OR (va thanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (toc sach)) ky dang xa hoi. thien van nam thuc ((va hanh) OR (va thanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky dang xa hoi. thien van nam thuc ((va hanh) OR (va thanh)) tai cua tre*.