Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
vai cau » va cau, van cau, vai cac
dua ban » dia ban, cua ban, qua ban
cua dua » cua duc, ca dua, cua dia
van cua » vang cua, ban cua, dan cua
su sach » so sach, vu sach
tao hoa » tao hoi, tao ho, tao hop
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
bao hoa » ba hoa, bao hoc, bao toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky sang) or (ky tang)) ((tao hoa) or (bao hoa)). hieu van cua dua ban hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) ((tao hoa) OR (bao hoa)). hieu van cua dua ban hanh vai cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky tang)) ((tao hoa) or (bao hoa)). hieu van cua dua ban hanh vai cau tren*.