Perhaps you should try some spelling variations:
tai thuyet » bai thuyet, thay thuyet, li thuyet
thuyet van » thuyet va, thuyet dan, thuyet can
nganh tai » nganh toan, doanh tai, nganh mac
tranh ky » trinh ky, thanh ky, hanh ky
thuat co » thuat do, thuat o
toc sach » hoc sach, doc sach, thuoc sach
te canh » ve canh, te danh, re canh
van hoc » van hoa

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 co hoc ) or ( ((te sach) OR (toc sach)) nganh tai thuyet van hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te canh tranh ky thuat co hoc ) OR ( ((te sach) OR (toc sach)) nganh tai thuyet van hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te canh tranh ky thuat co hoc ) or ( ((te sach) OR (toc sach)) nganh tai thuyet van hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te canh tranh ky thuat co hoc ) or ( ((te sach) OR (toc sach)) nganh tai thuyet van hoc ))*.