Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cong van » cong vang, cong san, song van
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
sach tai » sach tham, sach dao, sach xa
sach bai » sach dao, cac bai, sach xa
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve am » va am

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