Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
manh xay » nganh xay, van xay, dang xay
manh hai » lanh hai, minh hai, thanh hai
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
duc ban » duc van, dua ban, duc man
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky manh » ky anh, ky danh, ky hanh
cuu tre » cau tren, cau treo
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky manh xay hoi. hieu ve cam ((duc ban) OR (duc tan)) manh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky manh xay hoi. hieu ve cam ((duc ban) OR (duc tan)) manh hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky manh xay hoi. hieu ve cam ((duc ban) OR (duc tan)) manh hai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky manh xay hoi. hieu ve cam ((duc ban) OR (duc tan)) manh hai ((cua tre) or (cuu tre))*.