Perhaps you should try some spelling variations:
ban thanh » ban hang
cham thuc » nham thuc, pham thuc, tham thuc
ban hanh » ban hang
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
so dac » so dan
dac ky » cac ky, dan ky, sac ky
hoa su » hoa lu, hoa si, hoa du

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dac ky nang ma hoa. hieu ve cham thuc ((ban thanh) or (ban hanh)) hoa su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dac ky nang ma hoa. hieu ve cham thuc ((ban thanh) OR (ban hanh)) hoa su triet.
• Adding a wildcard symbol may retrieve word variants: so dac ky nang ma hoa. hieu ve cham thuc ((ban thanh) or (ban hanh)) hoa su triet*.