Perhaps you should try some spelling variations:
sach hanh » sach danh, sach han, sac hanh
xay thuat » ky thuat, my thuat, va thuat
sach ngan » sach ngon, sach nha, sach han
cay quyet » cao quyet, cay huyet, cach quyet
quyet hoc » huyet hoc, tuyet hoc, quyet hoa
hanh xay » hanh may, manh xay, anh xay
toan hoc » toan khoa, hoa hoc, tin hoc
ngan cay » ngan can, ngan hay, nganh xay
tu sach » thu sach, su sach, te sach
van hoc » van hoa
hoc hoi » hoc khoi, hoc hoa, hoc noi

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 hanh xay thuat ((toan hoc) OR (van hoc)) ) or ( tu sach ngan cay quyet hoc hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach hanh xay thuat ((toan hoc) OR (van hoc)) ) OR ( tu sach ngan cay quyet hoc hoi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach hanh xay thuat ((toan hoc) OR (van hoc)) ) or ( tu sach ngan cay quyet hoc hoi ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach hanh xay thuat ((toan hoc) OR (van hoc)) ) or ( tu sach ngan cay quyet hoc hoi ))*.