Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nang lai » nang tai, mang lai, nang cai
hang tai » hang va, dung tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cam hoc » cao hoc, am hoc, cam hoa
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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) or (sach y)) ((nang lai) or (hang tai)) hoi. hieu ve cam hoc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nang lai) OR (hang tai)) hoi. hieu ve cam hoc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) ((nang lai) or (hang tai)) hoi. hieu ve cam hoc va hanh vai cua tre*.