Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh lai » hanh lam, hanh tai, thanh lap
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
do thuc » hoc thuc, dan thuc
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho
va do » va dao, va doc, va co

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 tu) or (sach thue)) nang x hoi. hieu va do thuc day hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach thue)) nang x hoi. hieu va do thuc day hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach thue)) nang x hoi. hieu va do thuc day hanh lai cua tre*.