Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
nang ra » nang ma, lang ra, nang ro
qua nam » quan nam, cua nam, quang nam
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tuc » cua duc, cua thuoc, luat tuc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua su, cua cu, cua te

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 cao) or (nang ra)) hoi. hieu qua nam thuoc va danh vi ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang cao) OR (nang ra)) hoi. hieu qua nam thuoc va danh vi ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang cao) or (nang ra)) hoi. hieu qua nam thuoc va danh vi ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang cao) or (nang ra)) hoi. hieu qua nam thuoc va danh vi ((cua tu) OR (cua tuc))*.