Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
hieu van » hieu va, thien van, lieu va
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
anh di » xanh di, anh d, anh du
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu van ((nam thuoc) or (nam thu)) van ((anh di) OR (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu van ((nam thuoc) OR (nam thu)) van ((anh di) OR (danh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu van ((nam thuoc) or (nam thu)) van ((anh di) OR (danh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van ((nam thuoc) or (nam thu)) van ((anh di) OR (danh di)) cua tre*.