Perhaps you should try some spelling variations:
su triet » su viet, su tien
hang cau » hang dau, hang ca, nhung cau
ve triet » va trien
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty hang cau hoi. hieu va nam ((xuc va) or (tuc va)) hanh vi ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang cau hoi. hieu va nam ((xuc va) OR (tuc va)) hanh vi ((ve triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ty hang cau hoi. hieu va nam ((xuc va) or (tuc va)) hanh vi ((ve triet) or (su triet))*.