Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
lieu tinh » trieu tinh, diep tinh, bien tinh
thuc dung » thuoc dung, thuy dung, tuc dung
tac than » tac thanh, tam than, tac nhan
dac nhan » danh nhan, ca nhan, cac nha
cac nhan » ca nhan, cac nha, cam nhan
so lieu » so 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 lieu tinh - hanh trinh thuc dung trong ((tac than) or (((dac nhan) or (cac nhan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - hanh trinh thuc dung trong ((tac than) OR (((dac nhan) OR (cac nhan)))) cau.
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - hanh trinh thuc dung trong ((tac than) or (((dac nhan) or (cac nhan)))) cau*.