Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
va triet » va trien, ve triet, cua triet
thi lan » thi hanh, thi nang, thi lien
hanh di » hanh vi, hanh de, hang di
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. thi lan ((nam thuc) OR (nam thuoc)) vat hanh di ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. thi lan ((nam thuc) OR (nam thuoc)) vat hanh di ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. thi lan ((nam thuc) OR (nam thuoc)) vat hanh di ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. thi lan ((nam thuc) OR (nam thuoc)) vat hanh di ((va triet) or (va thiet))*.