Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
nang lai » mang lai, nang cai, nang hai
nang tai » hang tai, tang tai, sang tai
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
cua te » cua tu
co luc » coc luc, co luy
sac ky » cac ky, sai ky
ve co » vo co, va co, de co

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