Perhaps you should try some spelling variations:
dong xay » dang xay, mong xay, dong xa
cong xay » thong xay, trong xay, cong ty
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
hoc vat » hoc viet, thuc vat
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 thu ((dong xay) OR (cong xay)) hoi. hieu vu cham ((hoc va) or (hoc vat)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((dong xay) OR (cong xay)) hoi. hieu vu cham ((hoc va) OR (hoc vat)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((dong xay) OR (cong xay)) hoi. hieu vu cham ((hoc va) or (hoc vat)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((dong xay) OR (cong xay)) hoi. hieu vu cham ((hoc va) or (hoc vat)) hanh vi cuu tre*.