Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nam thuoc » nam thuc, nam thu, nha thuoc
chu theo » chuc theo, cau theo, chan theo
hanh hai » thanh hai, nhanh hai, hang hai
thuoc va » thuc va, thuoc ma, thuong va
quan nam » quang nam, xuan nam, quan am
cao hoi » co hoi, cao hoc, tao hoi
ly nang » ky nang, ly hang, ly vang
va hanh » van hanh, va thanh, va danh
hai chu » hai chau, hoi chu, hai chi
su sach » so sach, vu sach
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) or (cau hoi)). hieu quan nam thuoc va hanh hai chu theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) ((cao hoi) OR (cau hoi)). hieu quan nam thuoc va hanh hai chu theo.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) ((cao hoi) or (cau hoi)). hieu quan nam thuoc va hanh hai chu theo*.