Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac
ve cai » va cai, ve tai, ve cau

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 tay lang xa hoi. hieu ((ve cai) or (ve cac)) duc va hanh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay lang xa hoi. hieu ((ve cai) OR (ve cac)) duc va hanh vi ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: so sach tay lang xa hoi. hieu ((ve cai) or (ve cac)) duc va hanh vi ((cua triet) or (va triet))*.