Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
duc gia » quoc gia
hac duc » hoc duc, ha duc, thach duc
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
va hac » van hac, va khac, va cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach ty)) nang x hoi. lieu va hac duc gia thanh lap ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. lieu va hac duc gia thanh lap ((su triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang x hoi. lieu va hac duc gia thanh lap ((su triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang x hoi. lieu va hac duc gia thanh lap ((su triet) or (va triet))*.