Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
ve triet » va trien, su triet
dang xa » dang xay, lang xa, dang ha
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
ga dau » gia dau, giam dau, ngay dau
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. lieu va cac tuc ((ga dau) OR (va dau)) vai ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. lieu va cac tuc ((ga dau) OR (va dau)) vai ((cua triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. lieu va cac tuc ((ga dau) OR (va dau)) vai ((cua triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. lieu va cac tuc ((ga dau) OR (va dau)) vai ((cua triet) or (ve triet))*.