Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
suc van » su van, luc van, sac van
duc van » duc va, duc tan, duc manh
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky dang xay hoi. hieu va cao ((suc van) OR (duc van)) hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky dang xay hoi. hieu va cao ((suc van) OR (duc van)) hanh vi ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky dang xay hoi. hieu va cao ((suc van) OR (duc van)) hanh vi ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky dang xay hoi. hieu va cao ((suc van) OR (duc van)) hanh vi ((cua tre) or (cau treo))*.