Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu lai
ma hoi » xa hoi, ma hoa, me hoi
tu cai » tu cac, tu can, tu bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu vu cham duc tan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky nang ((ma hoi) OR (mai hoi)). hieu vu cham duc tan hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu vu cham duc tan hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu vu cham duc tan hanh vi cua tre*.