Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thanh va » thanh van, hanh va, thanh ha
ve cham » va cham, ve chat, vu cham
duc ban » duc van, dua ban, duc man
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoa doi » hoa dai, hoc doi, xoa doi
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
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 ((hoa doi) or (xa hoi)). hieu ve cham ((duc ban) OR (duc tan)) thanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ((hoa doi) OR (xa hoi)). hieu ve cham ((duc ban) OR (duc tan)) thanh va cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ((hoa doi) or (xa hoi)). hieu ve cham ((duc ban) OR (duc tan)) thanh va cua viet*".