Perhaps you should try some spelling variations:
thuyet van » thuyet va, thuyet dan, thuyet can
danh tranh » danh thanh, lanh tranh, doanh thanh
sach ngan » sach ngon, sach nha, sach han
thuat co » thuat do, thuat o
y thuyet » ly thuyet, li thuyet, ly huyet
te sach » toc sach
van hoc » van hoa
ngan y » nganh y, nhan y, nganh ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te ((danh tranh) or (canh tranh)) ky thuat co hoc ) or ( te sach ngan y thuyet van hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te ((danh tranh) OR (canh tranh)) ky thuat co hoc ) OR ( te sach ngan y thuyet van hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te ((danh tranh) or (canh tranh)) ky thuat co hoc ) or ( te sach ngan y thuyet van hoc ))*.