Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
luan han » luan hoan, luan phan, luan san
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: theo ((hieu manh) or (chieu tinh)) - hanh tang ((luan han) OR (luan van)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu tinh)) - hanh tang ((luan han) OR (luan van)) cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu tinh)) - hanh tang ((luan han) OR (luan van)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu tinh)) - hanh tang ((luan han) OR (luan van)) cong tac toan cao*.