Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
cua triet » cua viet, su triet, va triet
nang lai » nang tai, mang lai, nang cai
hanh tai » thanh tai, hang tai, han tai
lai hoa » dai hoa, loai hoc
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky
co luy » co ly
luy va » ly va, tuy va, luyen va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sac ky nang lai hoa. ((hieu ve) or (hieu va)) co luy va hanh tai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang lai hoa. ((hieu ve) OR (hieu va)) co luy va hanh tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang lai hoa. ((hieu ve) or (hieu va)) co luy va hanh tai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang lai hoa. ((hieu ve) or (hieu va)) co luy va hanh tai ((cua tre) OR (cua triet))*.