Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham thuc » pham thuc, tham thuc, pham thuoc
hang dai » hoang dai, hang tai, hang dau
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
lo hang » ly hang, le hang, cho hang
dai hai » dai han, dai hoi, dai tai
hieu vu » hieu va, hieu ve, hieu su
hanh di » hanh vi, hanh de, hang di
di su » doi su, ki su, da su

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 lo hang dai hai. hieu vu ((cham thuc) OR (nham thuc)) vat hanh di su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach lo hang dai hai. hieu vu ((cham thuc) OR (nham thuc)) vat hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: su sach lo hang dai hai. hieu vu ((cham thuc) OR (nham thuc)) vat hanh di su triet*.