Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
van hanh » van thanh, ban hanh, van anh
xay hanh » day nhanh, day thanh, xanh hanh
sang tao » hang tai
lieu ha » lieu nha, lieu va, liem ha
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, mang may
buu tre » cuu tre

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