Perhaps you should try some spelling variations:
thuyet bai » thuyet va
nganh tai » nganh toan, doanh tai, thanh tai
tranh ky » trinh ky, thanh ky, hanh ky
thuat do » thuat o
te canh » ve canh, te danh, re canh
te sach » toc sach
bai hoc » dai hoc
do hoc » co hoc, do hoa, du hoc

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

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