Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
va thanh » gia thanh, va tinh, le thanh
vai cua » dai cua, hai cua, lai cua
bo sach » co sach, hoc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach vu nang mai khoi. hieu ((ve cam) or (ve cac)) thuc ((va thanh) OR (ban thanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach vu nang mai khoi. hieu ((ve cam) OR (ve cac)) thuc ((va thanh) OR (ban thanh)) vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach vu nang mai khoi. hieu ((ve cam) or (ve cac)) thuc ((va thanh) OR (ban thanh)) vai cua viet".
• Adding a wildcard symbol may retrieve word variants: bo sach vu nang mai khoi. hieu ((ve cam) or (ve cac)) thuc ((va thanh) OR (ban thanh)) vai cua viet*.