Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
sach thap » sach tham, sach phap, sach nha
thanh tri » thanh tra, thanh tai, thanh hai
thu sach » tu sach, thuat sach, thuoc sach
thap tai » phap tai, tap tai, thai tai
trinh tu » trinh ky, trinh do
su canh » suc canh, su can, su anh
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach thap tai ) or ((( su canh trinh tu ) or ( su sach ((thanh tri) OR (chinh tri)) ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach thap tai ) OR ((( su canh trinh tu ) OR ( su sach ((thanh tri) OR (chinh tri)) )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach thap tai ) or ((( su canh trinh tu ) or ( su sach ((thanh tri) OR (chinh tri)) ))))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach thap tai ) or ((( su canh trinh tu ) or ( su sach ((thanh tri) OR (chinh tri)) ))))*.