Perhaps you should try some spelling variations:
quan thuc » luan thuc, qua thuc, quan chuc
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
va cau » va cac, va dau, va cao
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: su sach ky nang x hoi. hieu qua quan thuc day danh ((va cau) OR (van cau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu qua quan thuc day danh ((va cau) OR (van cau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu qua quan thuc day danh ((va cau) OR (van cau)) treo*.