Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cao » va cao, ve bao, ve cac

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 ve cao suc ((van hanh) OR (ban 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 ve cao suc ((van hanh) OR (ban 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 ve cao suc ((van hanh) OR (ban hanh)) vi ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky dang xay hoi. hieu ve cao suc ((van hanh) OR (ban hanh)) vi ((cua tre) or (cau treo))*.