Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang ma hoi. hieu ((ve cam) or (ve cac)) duc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ma hoi. hieu ((ve cam) OR (ve cac)) duc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang ma hoi. hieu ((ve cam) or (ve cac)) duc va hanh dai cua tre*.