Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thieu » toc thieu, hoc hien
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
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: ((theo chieu) or (hoc thieu)) tinh - hanh trang ((cua dung) OR (qua dung)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (hoc thieu)) tinh - hanh trang ((cua dung) OR (qua dung)) cong tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (hoc thieu)) tinh - hanh trang ((cua dung) OR (qua dung)) cong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (hoc thieu)) tinh - hanh trang ((cua dung) OR (qua dung)) cong tac toan tap*.