Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
day hanh » day nhanh, dao hanh, day manh
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
di cua » dai cua, doi cua, de cua
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: su sach y ((nang xa) or (nang ma)) hoi. hieu ve cac thuc ((day hanh) or (day thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. hieu ve cac thuc ((day hanh) OR (day thanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang ma)) hoi. hieu ve cac thuc ((day hanh) or (day thanh)) di cua tre*.