Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » thong cong, hang cong, nhung lang
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trang cua » tranh cua, tang cua, trung cua
nhung don » nhung van, nhung bo
dung cong » dung trong
vinh toan » tinh toan, hinh toan, minh toan
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: hoc chiet tach - hanh trang cua ((((nhung cong) OR (nhung don))) or (dung cong)) vinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trang cua ((((nhung cong) OR (nhung don))) OR (dung cong)) vinh toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh trang cua ((((nhung cong) OR (nhung don))) or (dung cong)) vinh toan cao*".