Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam danh » nam dinh, nam dan
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
xa danh » va danh, dia danh, van danh
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa

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