Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dang xay » dang van, van xay
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
y dang » ky dang, 2 dang, _ dang
ve cap » ve cac, le cap, ve cai
cua te » cua tu

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 ve cap cuu ((van thanh) or (ban hanh)) vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xay hoi. hieu ve cap cuu ((van thanh) OR (ban hanh)) vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dang xay hoi. hieu ve cap cuu ((van thanh) or (ban hanh)) vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xay hoi. hieu ve cap cuu ((van thanh) or (ban hanh)) vi ((cua tre) OR (cua te))*.