Perhaps you should try some spelling variations:
xang khoa » hang khoa, dang khoa, vang khoa
toc sach » hoc sach, doc sach, thuoc sach
cac vung » cac ung, cac chung, cach dung
khoa hoc » hoa hoc
van hanh » van thanh, ban hanh, van anh
cac cuoc » cac nuoc, ca cuoc, cac quoc
cua chu » sua chua
sach ty » sach y, sach tu, sach thu
cac vuc » cac nuoc, cac quoc
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: toc sach ty xang khoa hoc. hieu ve ((((cac vuc) OR (cac vung))) or (cac cuoc)) van hanh vi cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty xang khoa hoc. hieu ve ((((cac vuc) OR (cac vung))) OR (cac cuoc)) van hanh vi cua chu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty xang khoa hoc. hieu ve ((((cac vuc) OR (cac vung))) or (cac cuoc)) van hanh vi cua chu*".