Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh hung » thanh huong, thanh tung, thanh trung
hung huong » nhung huong, hung vuong, dung huong
thanh lap » thanh san, phan lap, thanh hai
theo hoc » thao hoc, te hoc, cho hoc
theo hop » theo phap, thao hoc, theo ucp
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo hoc) OR (theo hop)) sach - thanh cong thanh hung huong dan ((toan cao) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo hoc) OR (theo hop)) sach - thanh cong thanh hung huong dan ((toan cao) OR (thanh lap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo hoc) OR (theo hop)) sach - thanh cong thanh hung huong dan ((toan cao) or (thanh lap))".
• Adding a wildcard symbol may retrieve word variants: ((theo hoc) OR (theo hop)) sach - thanh cong thanh hung huong dan ((toan cao) or (thanh lap))*.