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 y, sach kem
hieu ha » hieu hoa, hieu va, hieu ca
nang ma » tang ma, nang cao, mang may
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, sang tao, mang may
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) ((nang ma) OR (sang ma)) 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 ty)) ((nang ma) or (sang ma)) hoi. hieu ha am thuc dang hanh vai su triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) ((nang ma) or (sang ma)) hoi. hieu ha am thuc dang hanh vai su triet*.