Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
cac khien » cac chien, cac phien, cach thien
khien hoc » nhiet hoc, dien hoc
san dinh » van dinh, san kinh, san tinh
dinh cac » tinh cach, dinh chuc, dinh chau
tien cac » thien cac, trien cac, vien cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
su sach » vu sach
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat san dinh cac khien hoc ) or ( ((su sach) OR (so sach)) tien cac khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat san dinh cac khien hoc ) OR ( ((su sach) OR (so sach)) tien cac khoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat san dinh cac khien hoc ) or ( ((su sach) OR (so sach)) tien cac khoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat san dinh cac khien hoc ) or ( ((su sach) OR (so sach)) tien cac khoa hoc ))*.