Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham thuc » pham thuc, tham thuc, pham thuoc
hang dau » hang va, hang tai
hanh dau » danh dau, han dau, hanh mau
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
tang ma » mang may, tang van
te sach » toc sach
y tang » ky tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y tang ma hoa. hieu van ((cham thuc) or (nham thuc)) va ((hanh dau) OR (hang dau)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang ma hoa. hieu van ((cham thuc) OR (nham thuc)) va ((hanh dau) OR (hang dau)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang ma hoa. hieu van ((cham thuc) or (nham thuc)) va ((hanh dau) OR (hang dau)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach y tang ma hoa. hieu van ((cham thuc) or (nham thuc)) va ((hanh dau) OR (hang dau)) su triet*.