Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sac » thu sach, thu san, thu xac
va danh » va dinh, va dan, va hanh
vu kham » vu khanh
vu cham » va cham, tu cham, qua cham
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
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: thu sac ky nang ma hoi. hieu ((vu cham) or (vu kham)) soc ((van hanh) or (va danh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ma hoi. hieu ((vu cham) OR (vu kham)) soc ((van hanh) OR (va danh)) tri cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ma hoi. hieu ((vu cham) or (vu kham)) soc ((van hanh) or (va danh)) tri cua tre*.