Perhaps you should try some spelling variations:
tranh nhiet » trinh nhiet, trach nhiem, trang thiet
trang tai » trang trai, tang tai, trang tri
tran tai » tran thi, toan tai, tran bai
tu canh » thu canh, tu chanh, tu can
nhiet d » nhiet do, nhiet de, nhiet doi
tu sach » thu sach, su sach, te sach
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu canh tranh nhiet d hoc ) or ( tu sach ((tran tai) OR (trang tai)) quoc hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh tranh nhiet d hoc ) OR ( tu sach ((tran tai) OR (trang tai)) quoc hoi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu canh tranh nhiet d hoc ) or ( tu sach ((tran tai) OR (trang tai)) quoc hoi ))".
• Adding a wildcard symbol may retrieve word variants: (( tu canh tranh nhiet d hoc ) or ( tu sach ((tran tai) OR (trang tai)) quoc hoi ))*.