Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
day danh » day manh, dai danh, dao danh
thuc day » thuc dan, thuc vat
qua thuc » qua phuc, qua tuc, rua thuc
qua qua » qua quan, qua cua, cua qua
vu sach » vu bach, vu khach
danh va » doanh va, hanh va, anh va
su sach » so sach
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) OR (vu sach)) ky nang x hoi. hieu qua qua thuc day danh va ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu qua qua thuc day danh va ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang x hoi. hieu qua qua thuc day danh va ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang x hoi. hieu qua qua thuc day danh va ((cau treo) or (cau theo))*.