Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
qua cam » qua cham, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
va cau » van cau, va dau, va cao
x hoi » xa hoi, o hoi, 5 hoi

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) OR (x ho)). hieu qua cam truc va hanh ((va cau) or (va cac)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (x ho)). hieu qua cam truc va hanh ((va cau) OR (va cac)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) OR (x ho)). hieu qua cam truc va hanh ((va cau) or (va cac)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) OR (x ho)). hieu qua cam truc va hanh ((va cau) or (va cac)) treo*.