Perhaps you should try some spelling variations:
te sach » toc sach
cua tre » cua te, cua triet, dua tren
anh hai » lanh hai, manh hai, anh thai
ban anh » ban hanh, ban banh, ban danh
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ty anh » ly anh, thuy anh
ky anh » ky danh, ly anh
ve cac » va cac, vien cac

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

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