Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tieu sach » chieu sach, dien sach, te sach
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh tran van dung cong thanh ((than tap) or (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh tran van dung cong thanh ((than tap) OR (han tap)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh tran van dung cong thanh ((than tap) or (han tap))*.