Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua vat
su triet » su viet, su tien, ve triet
thi hang » thi hanh, thi nang, thi hong
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, te sach, tu cach
ve cham » va cham, ve chat, vu cham
hang xa » hoang xa, hang va, hang ca
su sach » so sach, vu sach
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) thi hang xa hoi. hieu ve cham thuc va hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi hang xa hoi. hieu ve cham thuc va hanh lai ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thi hang xa hoi. hieu ve cham thuc va hanh lai ((su triet) or (cua viet))*.