Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
nam duoc » da duoc, dat duoc, nam moc
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
vai cua » dai cua, hai cua, lai cua
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ky) or (sac ky)) nang x hoi. lieu va ((nam duoc) OR (nam thuoc)) ban hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. lieu va ((nam duoc) OR (nam thuoc)) ban hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang x hoi. lieu va ((nam duoc) OR (nam thuoc)) ban hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. lieu va ((nam duoc) OR (nam thuoc)) ban hanh vai cua te*.