Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hai » thanh phan, thanh hoa, thanh san
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
van cac » van hac, van cau, van bac

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 ty ((nang xa) OR (nang x)) hoi. hieu van cac duc va ((hanh lai) or (thanh hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu van cac duc va ((hanh lai) OR (thanh hai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) OR (nang x)) hoi. hieu van cac duc va ((hanh lai) or (thanh hai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) OR (nang x)) hoi. hieu van cac duc va ((hanh lai) or (thanh hai)) cua triet*.