Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, te sach
hoi cuu » hoi chu, hoi cua, hoi cau
dua ban » dia ban, cua ban, qua ban
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, ve cai
ho cuu » ho chu, ho cua, so cuu
va cam » va cham, va cac, va cao

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 mai hoi. hieu ((ve cam) OR (va cam)) dua ban thanh ((hoi cuu) or (ho cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai hoi. hieu ((ve cam) OR (va cam)) dua ban thanh ((hoi cuu) OR (ho cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang mai hoi. hieu ((ve cam) OR (va cam)) dua ban thanh ((hoi cuu) or (ho cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai hoi. hieu ((ve cam) OR (va cam)) dua ban thanh ((hoi cuu) or (ho cuu)) tre*.