Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
thuc dang » thuoc dang, thuc dan, thuc dung
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach ty, sach kem
hieu ha » hieu hoa, hieu va, hieu ca
vai su » va su, van su, lai su
x hoi » xa hoi, x ho, 5 hoi
ha am » hoa am, ha nam, ha lam
o hoi » co hoi, o hoc, o hai

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 ky) or (sach y)) nang ((x hoi) OR (o hoi)). hieu ha am thuc dang hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang ((x hoi) OR (o hoi)). hieu ha am thuc dang hanh vai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) nang ((x hoi) OR (o hoi)). hieu ha am thuc dang hanh vai su triet*".