Perhaps you should try some spelling variations:
dong khoa » duong khoa, dong hoa, hong khoa
dung khoa » dung cho
ban tinh » ban thanh, quan tinh, ban hanh
te sach » toc sach
cam cuu » cham cuu, cap cuu
tinh vi » trinh vi, tinh voi, tinh va
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
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: te sach y ((dong khoa) OR (dung khoa)) hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((dong khoa) OR (dung khoa)) hoi. ((hieu ve) OR (lieu va)) cam cuu ban tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((dong khoa) OR (dung khoa)) hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((dong khoa) OR (dung khoa)) hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh vi cua tre*.