Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh dat » thanh san, thanh hai, thanh ha
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, duc va

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 y lang xa hoi. hieu van cam ((tuc va) or (tuc xa)) ((thanh dat) OR (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu van cam ((tuc va) OR (tuc xa)) ((thanh dat) OR (thanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. hieu van cam ((tuc va) or (tuc xa)) ((thanh dat) OR (thanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu van cam ((tuc va) or (tuc xa)) ((thanh dat) OR (thanh van)) cua tre*.