Perhaps you should try some spelling variations:
phan dai » phan dau, phan day, phan loai
su triet » su viet, ve triet
ban hanh » ban hang
dai ban » dai han, tai ban, di ban
ve phan » va phan, ke phan, ve phat
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc ((sach ty) or (sach y)) lang xa hoi. hieu ve phan dai ban hanh vi ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc ((sach ty) OR (sach y)) lang xa hoi. hieu ve phan dai ban hanh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc ((sach ty) or (sach y)) lang xa hoi. hieu ve phan dai ban hanh vi ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach ty) or (sach y)) lang xa hoi. hieu ve phan dai ban hanh vi ((su triet) OR (su tien))*.