Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
pham duy » pham duc
hanh lai » hanh lam, hanh tai, thanh loi
duy van » duy vat, dung van
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve pham » vi pham, v pham, ve phan

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