Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
hoc sach » hoc sinh, hoc cac, hoc anh
cham duc » pham duc, cham soc, pham duy
toc sac » toc sach, toc san, doc sach
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
cua te » cua tu
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) OR (hoc sach)) ky lang ha hoi. hieu ve cham duc ban thanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (hoc sach)) ky lang ha hoi. hieu ve cham duc ban thanh vi ((cua te) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (hoc sach)) ky lang ha hoi. hieu ve cham duc ban thanh vi ((cua te) or (cua su))*".