Perhaps you should try some spelling variations:
chat long » chat luong, hai long, ha long
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van
hieu cao » chieu cao, hieu cac, hieu ca
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 y ((dang xay) or (van xay)) hoi. hieu cao chat long ((va danh) OR (va hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((dang xay) OR (van xay)) hoi. hieu cao chat long ((va danh) OR (va hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((dang xay) or (van xay)) hoi. hieu cao chat long ((va danh) OR (va hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((dang xay) or (van xay)) hoi. hieu cao chat long ((va danh) OR (va hanh)) vi cua tre*.