Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
van thanh » ban thanh, van tuan
thanh vai » thanh hai, thanh van, thanh tai
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
sac ky » cac ky, sai ky
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: thuoc sac ky tang ma hoi. hieu va cac luc van thanh vai ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky tang ma hoi. hieu va cac luc van thanh vai ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky tang ma hoi. hieu va cac luc van thanh vai ((va triet) or (va trien))*.