Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
cham duc » pham duc, cham soc, pham duy
thanh va » thanh van, hanh va, thanh ha
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc ban » duc tan, duc van, dua ban
ky tang » ky dang, kho tang, ky trong
te sach » toc sach
va cua » va chua, via cua, ca cua

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) OR (ky nang)) ((hoa hoi) or (xa hoi)). hieu ve cham duc ban thanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) ((hoa hoi) OR (xa hoi)). hieu ve cham duc ban thanh va cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) OR (ky nang)) ((hoa hoi) or (xa hoi)). hieu ve cham duc ban thanh va cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) OR (ky nang)) ((hoa hoi) or (xa hoi)). hieu ve cham duc ban thanh va cua viet*.