Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tri » thanh tri, hanh tai, hanh trinh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu vo » hieu voi, hieu va, hieu ve
duc van » duc va, duc manh, duc phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu ((nang xa) OR (nang ma)) hoi. hieu vo co ((duc van) or (duc tan)) hanh tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang xa) OR (nang ma)) hoi. hieu vo co ((duc van) OR (duc tan)) hanh tri cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang xa) OR (nang ma)) hoi. hieu vo co ((duc van) or (duc tan)) hanh tri cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang xa) OR (nang ma)) hoi. hieu vo co ((duc van) or (duc tan)) hanh tri cua triet*.