Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
luan nhung » luan chung, luan hung, quan nhung
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chuc nang) or (lieu tinh)) - hanh tang luan nhung cong ((tac toan) or (tap toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chuc nang) OR (lieu tinh)) - hanh tang luan nhung cong ((tac toan) OR (tap toan)) tap.
• Adding a wildcard symbol may retrieve word variants: theo ((chuc nang) or (lieu tinh)) - hanh tang luan nhung cong ((tac toan) or (tap toan)) tap*.