Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
ban thanh » ban hang
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
ma hoi » mai hoi, xa hoi, ma hoa
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 hoi. hieu ve cham thuc ((ban thanh) OR (ban hanh)) hoa su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so dac ky nang ma hoi. 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 hoi. hieu ve cham thuc ((ban thanh) OR (ban hanh)) hoa su triet*.