Perhaps you should try some spelling variations:
sach tranh » canh tranh
cac nganh » hoc nganh
tranh ky » trinh ky, thanh ky, hanh ky
thuat co » thuat do, thuat o
nganh ly » nganh y, nganh ky, nganh xay
ly huyet » ly thuyet, li thuyet, ly chuyen
huyet va » thuyet va, quyet van, huyen van
te sach » toc sach
te cac » tu cac, ve cac, te cao
va hoc » van 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 tranh ky thuat co hoc ) or ( te cac nganh ly huyet va hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh ky thuat co hoc ) OR ( te cac nganh ly huyet va hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tranh ky thuat co hoc ) or ( te cac nganh ly huyet va hoc ))*.