Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh hai » thanh phan, thanh hoa, thanh san
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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: tu sach ty nang xa hoi. thien ((van lam) OR (van nam)) duc ban ((thanh hai) or (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. thien ((van lam) OR (van nam)) duc ban ((thanh hai) OR (thanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. thien ((van lam) OR (van nam)) duc ban ((thanh hai) or (thanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. thien ((van lam) OR (van nam)) duc ban ((thanh hai) or (thanh van)) cua tre*.