Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
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 ((cua tre) OR (cuu 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 ((cua tre) OR (cuu 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 ((cua tre) OR (cuu 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 ((cua tre) OR (cuu tre))*.