Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
va trien » va truyen, va tuyen, va tieng
ky tang » ky nang, ky dang, kho tang
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
ban vai » ban va, ban gai, ban tai
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao

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) OR (ma hoa)). hieu va cam luc van ban vai ((va thiet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky tang ((ma hoi) OR (ma hoa)). hieu va cam luc van ban vai ((va thiet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky tang ((ma hoi) OR (ma hoa)). hieu va cam luc van ban vai ((va thiet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky tang ((ma hoi) OR (ma hoa)). hieu va cam luc van ban vai ((va thiet) or (va trien))*.