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