Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
ve pham » vi pham, v pham, ve phan
sach tu » sach thu, cach tu, sach ty
su sach » so sach, vu sach
nong ma » dong ma, cong ma, nong va
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van

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

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