Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
lap cuu » cap cuu, lap cua
vu sach » vu bach, su sach, vu khach
van cac » van hac, van cau, van bac
sach ky » sac ky, sach y, sach ty
hoa doi » hoa dai, hoc doi, xoa doi
hoa hoi » khoa hoi, hoa hoc, hoc hoi
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky lang ((hoa hoi) OR (hoa doi)). hieu van cac duc ((van thanh) OR (ban thanh)) lap cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang ((hoa hoi) OR (hoa doi)). hieu van cac duc ((van thanh) OR (ban thanh)) lap cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang ((hoa hoi) OR (hoa doi)). hieu van cac duc ((van thanh) OR (ban thanh)) lap cuu tre*.