Perhaps you should try some spelling variations:
sach khoa » bach khoa, sach nha, anh khoa
khoa toc » khoa hoc, hoa toc, khoa thuoc
toc tien » hoc tien, toc mien, toc stieng
tien khi » trien khai
giam doc » gian doc, giam dau, gian don
tu sach » thu sach, su sach, te sach
khi cua » chi cua, thai cua
gi doc » gian doc

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 khoa toc tien khi cua ets : nhung ((gi doc) OR (giam doc)) vi đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach khoa toc tien khi cua ets : nhung ((gi doc) OR (giam doc)) vi đai".
• Adding a wildcard symbol may retrieve word variants: tu sach khoa toc tien khi cua ets : nhung ((gi doc) OR (giam doc)) vi đai*.