Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
hoat hoi » hoat doi, hoa hoi, hoat ho
van hanh » van thanh, ban hanh, van anh
chua tre » chua tri, cua tre, chua trieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky trong hoat hoi. hieu ((van lam) or (van nam)) duc van hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky trong hoat hoi. hieu ((van lam) OR (van nam)) duc van hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky trong hoat hoi. hieu ((van lam) or (van nam)) duc van hanh va chua tre*.