Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
theo sach » thuoc sach, te sach, theo lich
trang va » tran van, hang va
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (thien hach)) - hanh trang va nhung cong trinh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (thien hach)) - hanh trang va nhung cong trinh ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (thien hach)) - hanh trang va nhung cong trinh ((toan cau) or (toan tap))*.