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

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 am thuc van hanh lam ((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 am thuc van hanh lam ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach tai) or (sach bai)) lang xa hoi. hieu va am thuc van hanh lam ((su triet) or (cua viet))*.