Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cau » van hau, van chat, toan cau
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
van dau » van dao, phan dau
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ma hoi. hieu ((van cau) OR (van dau)) truc va thanh va ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. hieu ((van cau) OR (van dau)) truc va thanh va ((cua tre) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ma hoi. hieu ((van cau) OR (van dau)) truc va thanh va ((cua tre) or (cua viet))*".