Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
bang cong » dang cong, bang song, hang cong
ho chieu » hoc thieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
va bang » va nang, va lang, va 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 (ho chieu)) quang - ((hanh tang) or (hanh mang)) va bang cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) quang - ((hanh tang) OR (hanh mang)) va bang cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) quang - ((hanh tang) or (hanh mang)) va bang cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) quang - ((hanh tang) or (hanh mang)) va bang cong tac toan cao*.