Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ly quang » le quang, vu quang
tu sach » thu sach, su sach, te sach
ca hoi » cau hoi, cua hoi, xa hoi
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
qua ca » qua cac, qua cua, qua cai
vi su » va su, ve su, ki su

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 ((ly hang) OR (ly quang)) ca hoi. hieu qua ca ((xuc va) or (tuc va)) hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (ly quang)) ca hoi. hieu qua ca ((xuc va) OR (tuc va)) hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly hang) OR (ly quang)) ca hoi. hieu qua ca ((xuc va) or (tuc va)) hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) OR (ly quang)) ca hoi. hieu qua ca ((xuc va) or (tuc va)) hanh vi su triet*.