Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh tai » thanh hai, thanh toan, doanh tai
duc phung » duc hung, duc thang, duc trung
tai cua » thai cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

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 ve cam ((duc phung) or (suc manh)) thanh tai 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 ve cam ((duc phung) OR (suc manh)) thanh tai 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 ve cam ((duc phung) or (suc manh)) thanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) OR (nang x)) hoi. hieu ve cam ((duc phung) or (suc manh)) thanh tai cua triet*.