Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
thuoc va » thuc va, thuoc ma, thuong va
va hanh » van hanh, va thanh, va danh
hieu va » hieu qua
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang
vi cua » vai cua, di cua

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) or (thu sach)) lo nang xa hoi. ((lieu va) or (hieu va)) nam thuoc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) lo nang xa hoi. ((lieu va) OR (hieu va)) nam thuoc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) lo nang xa hoi. ((lieu va) or (hieu va)) nam thuoc va hanh vi cua viet*.