Perhaps you should try some spelling variations:
thay thuyet » thao tuyet, thay truyen
sach nganh » sach ngan, sach tranh, cac nganh
sach trinh » sach tranh, hanh trinh, sach kinh
nganh thay » nganh thanh, nganh tai, nganh toan
te sach » toc sach
thuat o » thuat do
va hoc » van hoc
o hoc » co hoc, mo hoc, so 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 sach trinh ky thuat o hoc ) or ( te sach nganh thay thuyet va hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trinh ky thuat o hoc ) OR ( te sach nganh thay thuyet va hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach trinh ky thuat o hoc ) or ( te sach nganh thay thuyet va hoc ))*.