Perhaps you should try some spelling variations:
nha thuoc » nhan thuc, nha hoc
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
nang ro » nang co, nang ho, nang rong
vai cua » dai cua, hai cua, lai cua
nang ra » nang ma, lang ra, nang va
va hanh » van hanh, va thanh, va danh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
cua te » cua tu
nuoc » quoc, duoc, ngoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang ro) or (nang ra)) hoi. hieu va ((nha thuoc) OR (nha nuoc)) va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang ro) OR (nang ra)) hoi. hieu va ((nha thuoc) OR (nha nuoc)) va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang ro) or (nang ra)) hoi. hieu va ((nha thuoc) OR (nha nuoc)) va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang ro) or (nang ra)) hoi. hieu va ((nha thuoc) OR (nha nuoc)) va hanh vai cua te*.