Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
cau thuc » cau truc, cuu thuc, can thuc
cac qua » cau qua, tac quan
cac cua » cach cua, ca cua, tac cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va cau » van cau, va cac, va 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 nang ma hoi. hieu va cau thuc ((va thanh) OR (ban thanh)) ((cac cua) or (cac qua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu va cau thuc ((va thanh) OR (ban thanh)) ((cac cua) OR (cac qua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu va cau thuc ((va thanh) OR (ban thanh)) ((cac cua) or (cac qua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu va cau thuc ((va thanh) OR (ban thanh)) ((cac cua) or (cac qua)) triet*.