Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
dang xay » dang van, van xay
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
cac cuc » cac cuoc, cac nuoc, cac cach
sach ky » sac ky, sach y, sach ty
cac cua » cach cua, cac qua, ca cua
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 ky dang xay hoi. hieu ve ((cac cuc) or (cac cua)) ban tinh vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu ve ((cac cuc) OR (cac cua)) ban tinh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. hieu ve ((cac cuc) or (cac cua)) ban tinh vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu ve ((cac cuc) or (cac cua)) ban tinh vai ((cua tre) OR (cua te))*.