Perhaps you should try some spelling variations:
thien van » thi van
dua tren » dung tren
sach dai » sach dao, sach bai, sach dat
dai nang » da nang, dai dang, dai thang
thanh va » thanh van, hanh va, thanh ha
thai tuc » thai thuc, thai thuy, thai hoc
cua tre » cua te, cuu tre, cua triet
bo sach » co sach, hoc sach
hac tuc » thac toc
nang xa » nang x, lang xa, nang ma

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 dai nang xa hoi. thien van ((hac tuc) OR (thai tuc)) gia thanh va ((cua tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach dai nang xa hoi. thien van ((hac tuc) OR (thai tuc)) gia thanh va ((cua tre) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach dai nang xa hoi. thien van ((hac tuc) OR (thai tuc)) gia thanh va ((cua tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: bo sach dai nang xa hoi. thien van ((hac tuc) OR (thai tuc)) gia thanh va ((cua tre) or (dua tren))*.