Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hoc chiet » hoc nhiet, hoc hien, hoc viet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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) OR (hoc thiet)) tach - hanh trang va dung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc thiet)) tach - hanh trang va dung cong tac toan cau*".