Perhaps you should try some spelling variations:
dong khoan » dong khoa, dung khoa, dong hoa
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, su sach, te sach
cuu ban » cuu van, cua ban, cuu san
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
cam cuu » cham cuu, cap cuu
y dong » ly dong, ty dong, _ dong
vi 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: tu sach y dong khoan hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dong khoan hoi. ((hieu ve) OR (lieu va)) cam cuu ban tinh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dong khoan hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y dong khoan hoi. ((hieu ve) or (lieu va)) cam cuu ban tinh ((vi cua) OR (vai cua)) tre*.