Perhaps you should try some spelling variations:
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
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 nhiet)) tach - hanh hang va dung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) OR (hoc nhiet)) tach - hanh hang va dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) OR (hoc nhiet)) tach - hanh hang va dung cong tac toan cau*.