Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac hoc » cach hoc, cac hop, bac hoc
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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: tu sac ky ((mang xa) or (nang ma)) hoi. hieu ve cac hoc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((mang xa) OR (nang ma)) hoi. hieu ve cac hoc va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((mang xa) or (nang ma)) hoi. hieu ve cac hoc va hanh lai cua tre*.