Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach tai » sach bai, sach tham, sach dao
tai lang » tai cong, thi lan, tai san
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham

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 tai lang xa hoi. hieu ve cham thuc day hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tai lang xa hoi. hieu ve cham thuc day hanh lai ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su sach tai lang xa hoi. hieu ve cham thuc day hanh lai ((su triet) or (cua viet))*.