Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nham thuc » nhan thuc, nam thuc, nham thu
cham truc » cau truc, pham thuc, nam truc
thanh di » thanh doi, thanh de, thanh do
so sach » bo sach, co sach, hoc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
so sanh » do sanh
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (so sanh)) vu nang ma hoa. hieu ve ((cham truc) or (nham thuc)) ban thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) vu nang ma hoa. hieu ve ((cham truc) OR (nham thuc)) ban thanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) vu nang ma hoa. hieu ve ((cham truc) or (nham thuc)) ban thanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) vu nang ma hoa. hieu ve ((cham truc) or (nham thuc)) ban thanh di cua te*.