Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban danh » ban doanh, ban hanh, ban dan
dang xay » dang van, van xay
danh vai » danh sai, danh va, doanh van
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
co cua » con cua, cong cua, cuoi cua

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 ((ca cua) OR (co cua)) ban danh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu ve ((ca cua) OR (co cua)) ban danh vai ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. hieu ve ((ca cua) OR (co cua)) ban danh vai ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu ve ((ca cua) OR (co cua)) ban danh vai ((cua tre) or (su triet))*.