Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
hai hau » hai chau, dai hau, hai hai
hai cau » hai chau, hai chu, hoi cau
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
va nam » van nam, ha nam, va nay
y nang » ky nang, v nang, may nang

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 ((y nang) or (ly nang)) cao hoi. hieu va nam thuoc va hanh ((hai cau) OR (hai hau)) thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) cao hoi. hieu va nam thuoc va hanh ((hai cau) OR (hai hau)) thi.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ly nang)) cao hoi. hieu va nam thuoc va hanh ((hai cau) OR (hai hau)) thi".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) cao hoi. hieu va nam thuoc va hanh ((hai cau) OR (hai hau)) thi*.