Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
cua triet » su triet, va triet
thanh co » thanh do, thanh ca, thanh ho
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van hac » van hoc, van ha, van chat
van hai » van ha, van chat, van hanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu ((van hac) OR (van hai)) duc tan thanh co ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu ((van hac) OR (van hai)) duc tan thanh co ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu ((van hac) OR (van hai)) duc tan thanh co ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu ((van hac) OR (van hai)) duc tan thanh co ((cua triet) or (cua viet))*.