Perhaps you should try some spelling variations:
thuoc dang » thuoc dung, thuoc khang, thuc dan
dang hanh » dang thanh, ban hanh, dang van
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
hieu ha » hieu hoa, hieu va, hieu ca
sach ky » sach ty, sach kem, sach hay
sang ma » tang ma, nang ma, sang tao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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))) or (sac ky)) sang ma hoi. hieu ha nam thuoc dang hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach y))) OR (sac ky)) sang ma hoi. hieu ha nam thuoc dang hanh vai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach ky) OR (sach y))) or (sac ky)) sang ma hoi. hieu ha nam thuoc dang hanh vai cua viet*".