Perhaps you should try some spelling variations:
tinh nhiet » trinh nhiet, tinh thiet, trinh thiet
canh tinh » hanh tinh, manh tinh, canh tranh
sach tran » sach tranh, sach tren, vach tran
thi quoc » thu quoc, tai quoc, thi nuoc
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 tinh nhiet d hoc ) or ( tu sach tran thi quoc hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh tinh nhiet d hoc ) OR ( tu sach tran thi quoc hoi )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh tinh nhiet d hoc ) or ( tu sach tran thi quoc hoi ))*.