Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ke phan » kenh phan, ke thang
ve phan » va phan, ve phat, vi phan
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
do van » dao van, so van
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o lang xa hoi. hieu ((ke phan) OR (ve phan)) ((do van) OR (vo van)) hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach o lang xa hoi. hieu ((ke phan) OR (ve phan)) ((do van) or (vo van)) hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach o lang xa hoi. hieu ((ke phan) OR (ve phan)) ((do van) or (vo van)) hanh vi su triet*.