Perhaps you should try some spelling variations:
sach tai » sach bai, sach tham, sach dao
cong van » cong vang, cong san, song van
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien
ve triet » va trien
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
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 cong van hoi. hieu ve am thuc va hanh lai ((((su triet) OR (ve triet))) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tai cong van hoi. hieu ve am thuc va hanh lai ((((su triet) OR (ve triet))) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tai cong van hoi. hieu ve am thuc va hanh lai ((((su triet) OR (ve triet))) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach tai cong van hoi. hieu ve am thuc va hanh lai ((((su triet) OR (ve triet))) or (cua viet))*.