Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hang dai » hoang dai, hang tai, hang dau
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
sach ly » sach lo, sach ty, sach hay
dai tai » dai hai, dai thao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
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 ly) or (sach y)) hang dai tai. hieu vu cham thuc vat hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach y)) hang dai tai. hieu vu cham thuc vat hanh di su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach y)) hang dai tai. hieu vu cham thuc vat hanh di su triet*.