Perhaps you should try some spelling variations:
hoc chieu » hoc thieu, hoc hien, hoc dieu
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 chieu) or (ho chieu)) tinh - hanh ((trung va) or (trung quoc)) dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (ho chieu)) tinh - hanh ((trung va) OR (trung quoc)) dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (ho chieu)) tinh - hanh ((trung va) or (trung quoc)) dung cong tac toan cau*.