Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
hanh di » hanh de, hang di, danh di
cua tre » cua te, cuu tre, dua tren
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
luc va » duc va, tuc va, loc va

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: hoc sach o lang xa hoi. hieu va cac luc va ((hanh di) OR (hanh vi)) ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach o lang xa hoi. hieu va cac luc va ((hanh di) or (hanh vi)) ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach o lang xa hoi. hieu va cac luc va ((hanh di) or (hanh vi)) ((cua tre) OR (cua triet))*.