Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, cay thuoc
thien van » thi van
nha thuoc » nha nuoc, nhan thuc, nha hoc
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((hieu va) or (thien van)) ((nam thuoc) or (nha thuoc)) va hanh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu va) OR (thien van)) ((nam thuoc) OR (nha thuoc)) va hanh vi cau treo.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu va) or (thien van)) ((nam thuoc) or (nha thuoc)) va hanh vi cau treo*.