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 » sach y, sach ty, sach kem
hieu ha » hieu hoa, hieu va, hieu ca
hoa hoi » khoa hoi, hoa hoc, hoa doi
ha hoi » ha noi, xa hoi, va hoi
sac ky » cac ky, sai ky
vai su » va su, van su, lai su
ha am » hoa am, ha nam, ha lam

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 (sac ky)) lang ((ha hoi) OR (hoa 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 (sac ky)) lang ((ha hoi) OR (hoa 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 (sac ky)) lang ((ha hoi) OR (hoa hoi)). hieu ha am thuc dang hanh vai su triet*".