Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
thanh va » thanh van, hanh va, thanh ha
hieu he » hieu ve, hiem he, hieu le
tu sach » thu sach, te sach, vu sach
su sach » so sach, vu sach
tu cach » tu cac
he nam » ha nam, nghe nam
vai su » va su, van su, lai su
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) or (tu cach))) or (su sach)) thi thanh va hoi. hieu he nam thuc day hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (tu cach))) OR (su sach)) thi thanh va hoi. hieu he nam thuc day hanh vai su triet*.