Perhaps you should try some spelling variations:
lanh tranh » canh tranh, lan tranh, hanh trinh
danh thanh » dinh thanh, dang thanh, nhanh thanh
thuyet van » thuyet va, thuyet dan, thuyet can
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
ngan y » nganh y, nhan y, nganh ky
hoa » khoa

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

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