Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
hieu cach » hieu cac, chieu sach, hieu ca
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » ban than, dan toan, dang thanh
dan chan » dan gian, dan ca, van chat
van than » van thanh, van thang, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu cach - hanh trinh vat nhung cong ((((dan than) or (dan chan))) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu cach - hanh trinh vat nhung cong ((((dan than) OR (dan chan))) OR (van than)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu cach - hanh trinh vat nhung cong ((((dan than) or (dan chan))) or (van than)) cau*.