Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang
luc va » duc va
tuc va » thuc va, truc va, tuc xa
loc va » hoc 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 dang xay hoi. hieu va chat ((loc va) or (((luc va) OR (tuc va)))) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xay hoi. hieu va chat ((loc va) OR (((luc va) OR (tuc va)))) thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dang xay hoi. hieu va chat ((loc va) or (((luc va) OR (tuc va)))) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xay hoi. hieu va chat ((loc va) or (((luc va) OR (tuc va)))) thanh dai cua tre*.