Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thanh ha » thanh hoa, thanh hai, nhanh ha
vu cham » va cham, vu kham, tu cham
dua ban » dia ban, cua ban, qua ban
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky tang » ky nang, ky dang, kho tang
ve cham » va cham, ve chat, ve chim
ha su » hay su, hoa su, nha su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky tang ((hoa hoi) or (xa hoi)). hieu ((ve cham) OR (vu cham)) dua ban thanh ha su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ((hoa hoi) OR (xa hoi)). hieu ((ve cham) OR (vu cham)) dua ban thanh ha su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ((hoa hoi) or (xa hoi)). hieu ((ve cham) OR (vu cham)) dua ban thanh ha su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ((hoa hoi) or (xa hoi)). hieu ((ve cham) OR (vu cham)) dua ban thanh ha su triet*.