Perhaps you should try some spelling variations:
khoan hoi » khoan nhoi, khoa hoc, khoa doi
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
khoa hoi » khoa hoc, khoa doi, khoa noi
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
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: toc sach ty dang ((khoa hoi) OR (khoan hoi)). lieu va cac xuc ((va thanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty dang ((khoa hoi) OR (khoan hoi)). lieu va cac xuc ((va thanh) OR (va danh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty dang ((khoa hoi) OR (khoan hoi)). lieu va cac xuc ((va thanh) or (va danh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty dang ((khoa hoi) OR (khoan hoi)). lieu va cac xuc ((va thanh) or (va danh)) vi cua tre*.