Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
lang hoa » hang hoa, lang ha, nang hoa
vu sach » vu bach, su sach, vu khach
lap cua » lai cua, tap cua, lam cua
van hac » van hoc, van ha, van hai
sach ky » sac ky, sach y, sach ty
van cac » van cau, van bac, dan cac
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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. hieu ((van cac) OR (van hac)) duc ((van thanh) or (ban thanh)) lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang hoa hoi. hieu ((van cac) OR (van hac)) duc ((van thanh) OR (ban thanh)) lap cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang hoa hoi. hieu ((van cac) OR (van hac)) duc ((van thanh) or (ban thanh)) lap cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang hoa hoi. hieu ((van cac) OR (van hac)) duc ((van thanh) or (ban thanh)) lap cua tre*.