Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
cham duc » pham duc, cham soc, pham duy
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
sach ty » sach y, sach thu, xach tay
tang ma » mang may, tang van
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
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 ty) or (sach tu)) tang ma hoi. ((hieu vu) OR (hieu ve)) cham duc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) tang ma hoi. ((hieu vu) OR (hieu ve)) cham duc va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach tu)) tang ma hoi. ((hieu vu) OR (hieu ve)) cham duc va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tu)) tang ma hoi. ((hieu vu) OR (hieu ve)) cham duc va hanh lam cua tre*.