Perhaps you should try some spelling variations:
quan thuc » luan thuc, quan chuc, thuan thuc
qua thuc » qua phuc, qua tuc, rua thuc
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
va cau » van cau, va cac, va dau
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: vu sach ky nang x hoi. hieu qua ((quan thuc) OR (qua thuc)) ((va hanh) or (va thanh)) va cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu qua ((quan thuc) OR (qua thuc)) ((va hanh) OR (va thanh)) va cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu qua ((quan thuc) OR (qua thuc)) ((va hanh) or (va thanh)) va cau treo".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu qua ((quan thuc) OR (qua thuc)) ((va hanh) or (va thanh)) va cau treo*.