Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
thuoc va » thuc va, thuoc ma, thuong va
chu theo » chuc theo, cau theo, chan theo
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
su sach » so sach, vu sach
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) OR (hang 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. hieu va nam thuoc va ((hanh hai) OR (hang hai)) chu theo.
• 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) OR (hang hai)) chu theo".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) cao hoi. hieu va nam thuoc va ((hanh hai) OR (hang hai)) chu theo*.