Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
xa hanh » xa thanh, xa khanh, va hanh
tai cua » thai cua, tai cuc, dai cua
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. lieu va ((nam thuc) or (nam thuoc)) xa hanh ((tai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. lieu va ((nam thuc) OR (nam thuoc)) xa hanh ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. lieu va ((nam thuc) or (nam thuoc)) xa hanh ((tai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. lieu va ((nam thuc) or (nam thuoc)) xa hanh ((tai cua) OR (tri cua)) tre*.