Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
van lao » van dao, van bao, van lam
la tren » loai tren, dua tren, dat tren
va hanh » van hanh, va thanh, va danh
lao luc » bao luc
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
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: ((te sach) OR (toc sach)) ky lang van hoa. thien van lao luc va hanh vi ((la tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang van hoa. thien van lao luc va hanh vi ((la tren) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky lang van hoa. thien van lao luc va hanh vi ((la tren) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky lang van hoa. thien van lao luc va hanh vi ((la tren) or (cua tre))*.