Perhaps you should try some spelling variations:
ban nhanh » ban thanh, ban nhan, nhan nhanh
cham tuc » nham thuc, pham thuc, tham thuc
ban hanh » ban hang
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ma hoi » mai hoi, xa hoi, ma hoa
ha su » hay su, hoa su, nha su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu ve cham tuc ((ban nhanh) OR (ban hanh)) ha su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. hieu ve cham tuc ((ban nhanh) OR (ban hanh)) ha su triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu ve cham tuc ((ban nhanh) OR (ban hanh)) ha su triet*.