Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach va, bach van, cach van
sach han » sach tham, sach danh, sach nang
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, dua tren
ve cau » ke cau, va cau, ve cac

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: so ((sach van) OR (sach han)) lang xa hoi. hieu ve cau truc van hanh va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach van) OR (sach han)) lang xa hoi. hieu ve cau truc van hanh va ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so ((sach van) OR (sach han)) lang xa hoi. hieu ve cau truc van hanh va ((cua tre) or (cua triet))*.