Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dieu tinh » diep tinh, lieu tinh, dien tinh
luan tang » lan tang, xuan trang, luan thanh
luan nang » luan van, van nang, luan san
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan
so dieu » bo dieu, hoc dieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so dieu tinh - hanh trinh ((luan tang) or (luan nang)) cong ((manh toan) or (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dieu tinh - hanh trinh ((luan tang) OR (luan nang)) cong ((manh toan) OR (dan toan)) cau.
• Adding a wildcard symbol may retrieve word variants: so dieu tinh - hanh trinh ((luan tang) or (luan nang)) cong ((manh toan) or (dan toan)) cau*.