Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
nang dai » nang dau, nang tai, lang dai
hanh hai » thanh hai, nhanh hai, hang hai
dai hai » dai han, dai hoi, dai tai
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang dai hai. hieu ve cac luc va hanh hai ((cuu tre) or (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang dai hai. hieu ve cac luc va hanh hai ((cuu tre) OR (cua thuoc)).
• Adding a wildcard symbol may retrieve word variants: su sac ky nang dai hai. hieu ve cac luc va hanh hai ((cuu tre) or (cua thuoc))*.