Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
tap toan » tap doan, tap quan, bai toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo yeu tinh - hanh trinh chua ((dong cong) or (dung cong)) ((tap toan) or (van tuan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo yeu tinh - hanh trinh chua ((dong cong) OR (dung cong)) ((tap toan) OR (van tuan)) tap.
• Adding a wildcard symbol may retrieve word variants: theo yeu tinh - hanh trinh chua ((dong cong) or (dung cong)) ((tap toan) or (van tuan)) tap*.