Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
hoc thien » hoc thieu, hoc thiet, hoc tien
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 thien) OR (hoc hien)) hach - hanh trinh cua nhung cong tac toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) OR (hoc hien)) hach - hanh trinh cua nhung cong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) OR (hoc hien)) hach - hanh trinh cua nhung cong tac toan tap*.