Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
luu truc » luu tru, cau truc, cuu thuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu va » lieu va, hieu qua
xac va » tac va, ac va, bac va
vi luu » vi lua

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) OR (xa hoi)). hieu va thanh ((xac va) or (duc va)) thanh vi luu truc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((xay hoi) OR (xa hoi)). hieu va thanh ((xac va) OR (duc va)) thanh vi luu truc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((xay hoi) OR (xa hoi)). hieu va thanh ((xac va) or (duc va)) thanh vi luu truc".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ((xay hoi) OR (xa hoi)). hieu va thanh ((xac va) or (duc va)) thanh vi luu truc*.