Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
hieu quan » hieu qua, lieu quan, thien quan
danh vien » doanh vien, dan vien, danh kien
danh viet » anh viet, ninh viet, nang viet
quan cau » quang cao, toan cau, quan ha
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
truc va » thuc va, thuc vat, trung va
sac ky » cac ky, sai ky

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 lang xa hoi. hieu quan cau truc va ((danh vien) or (danh viet)) cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky lang xa hoi. hieu quan cau truc va ((danh vien) OR (danh viet)) cac tro.
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky lang xa hoi. hieu quan cau truc va ((danh vien) or (danh viet)) cac tro*.