Perhaps you should try some spelling variations:
thuyet hoa » thuyet va, huyet hoc
sach tham » sach nha
ky thuyet » ly thuyet, li thuyet, ly huyet
thuat co » thuat do, thuat o
thanh ky » hanh ky, than ky, thanh tay
te sach » toc sach
tham ky » pham ky, than ky, tham my
te bac » ten bac, te ban, he bac

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