Perhaps you should try some spelling variations:
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
anh hai » lanh hai, manh hai, anh thai
duc ban » duc van, dua ban, duc man
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh
ky dang » ky nang
cua tre » cua te, cuu tre, cua triet
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 dang) OR (ky danh)) xay hoi. hieu ve cac ((duc ban) or (duc tan)) anh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky danh)) xay hoi. hieu ve cac ((duc ban) OR (duc tan)) anh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) OR (ky danh)) xay hoi. hieu ve cac ((duc ban) or (duc tan)) anh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) OR (ky danh)) xay hoi. hieu ve cac ((duc ban) or (duc tan)) anh hai cua tre*.