Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
khung cong » nhung cong, khung long, phung cong
trung dai » truong dai, truong dao, trung cap
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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: toc thieu sach - thanh ((trung dai) OR (trung tam)) khung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - thanh ((trung dai) OR (trung tam)) khung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - thanh ((trung dai) OR (trung tam)) khung cong dan toan cau*.