Perhaps you should try some spelling variations:
phan xay » phan dau, phan lap, van xay
thuat va » thuyet va, thuat xay, thuat bai
ly thuat » ky thuat, my thuat, ly thuyet
toan hoc » toan khoa, van hoc, hoa hoc
su sach » so sach, vu sach
nha xay » nha may, pham xay, nghe xay
bo sach » co sach, hoc sach
va hoc » van hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach ((nha xay) OR (phan xay)) thuat va hoc ) or ( bo sach nha ly thuat toan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach ((nha xay) OR (phan xay)) thuat va hoc ) OR ( bo sach nha ly thuat toan hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach ((nha xay) OR (phan xay)) thuat va hoc ) or ( bo sach nha ly thuat toan hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach ((nha xay) OR (phan xay)) thuat va hoc ) or ( bo sach nha ly thuat toan hoc ))*.