Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trang » thanh trung, canh tranh, hanh trinh
hien sach » dien sach, kien sach, chieu sach
trang cua » tranh cua, tang cua, trung cua
tong cong » trong cong, cong cong, dung cong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
cua tong » cua cong, cua dong, cua nong
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: hoc ((hien sach) or (thien hach)) - hanh trang cua tong cong hach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - hanh trang cua tong cong hach toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - hanh trang cua tong cong hach toan cau*.