Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
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 sach ky nang xa hoi. hieu ((va cam) or (ve cham)) luc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((va cam) OR (ve cham)) luc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((va cam) or (ve cham)) luc van hanh tai cua tre*.