Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tri » thanh tri, hanh tai, hanh trinh
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
dai ky » dan ky, dai ly
sai ky » sac ky
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((dai ky) OR (sai ky)) nang xa hoi. lieu va cam duc van hanh tri cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((dai ky) OR (sai ky)) nang xa hoi. lieu va cam duc van hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((dai ky) OR (sai ky)) nang xa hoi. lieu va cam duc van hanh tri cua tre*.