Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
hieu vu » hieu ve, hieu su, dieu vu
tong ma » tang ma, dong ma, cong ma
tu tong » tu tuong, tu trong, tu dong
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa

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 tong ma hoi. ((hieu vu) or (hieu va)) cham duc va hanh lam ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu tong ma hoi. ((hieu vu) OR (hieu va)) cham duc va hanh lam ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu tong ma hoi. ((hieu vu) or (hieu va)) cham duc va hanh lam ((cua tre) OR (cua triet))*".