Perhaps you should try some spelling variations:
cac nganh » hoc nganh
nganh xay » nganh mac, nganh y, nganh ma
xay thuat » ky thuat, my thuat, va thuat
sach tran » sach tranh, sach tren, vach tran
thu thuat » phau thuat, thu hut
thuat hoa » thuat toan, thuyet hoa, thuat do
toan hoc » van hoc, tin hoc
tran thu » tran thuy, tran thi, tuan thu
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac nganh xay thuat ((toan hoc) OR (toan khoa)) ) or ( tu sach tran thu thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac nganh xay thuat ((toan hoc) OR (toan khoa)) ) OR ( tu sach tran thu thuat hoa hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu cac nganh xay thuat ((toan hoc) OR (toan khoa)) ) or ( tu sach tran thu thuat hoa hoc ))*".