Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam thuc » am thuc, nam thuc, cam thu
su triet » su viet, su tien, ve triet
sach bai » sach dao, cac bai, sach xa
hanh lai » hanh lam, hanh tai, thanh lap
sach tai » sach tham, sach dao, sach xa
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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) OR (sach bai)) lang xa hoi. hieu va cam thuc va hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tai) OR (sach bai)) lang xa hoi. hieu va cam thuc va hanh lai ((su triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tai) OR (sach bai)) lang xa hoi. hieu va cam thuc va hanh lai ((su triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach tai) OR (sach bai)) lang xa hoi. hieu va cam thuc va hanh lai ((su triet) or (cua viet))*.