Perhaps you should try some spelling variations:
thien van » thi van
sach doi » sach hoi, sach moi, sach dao
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
hac tuc » thac toc, thai tuc
van hac » van hoc, van ha, van hai
ca tren » cau tren, cu tren, la tren
nang xa » lang xa, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach doi ((nang xa) OR (nang x)) hoi. thien van hac tuc va hanh vi ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach doi ((nang xa) OR (nang x)) hoi. thien van hac tuc va hanh vi ((cua tre) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach doi ((nang xa) OR (nang x)) hoi. thien van hac tuc va hanh vi ((cua tre) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: bo sach doi ((nang xa) OR (nang x)) hoi. thien van hac tuc va hanh vi ((cua tre) or (ca tren))*.