Perhaps you should try some spelling variations:
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
cai ky » cao ky, cac ky, sai ky
cam ky » cao ky, cac ky
de cua » le cua, te cua, dieu cua

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

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