Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
thuat hang » thuat hung, thuat bang, thuat mang
hang cong » dang cong, hang nong, bang cong
cong san » cong tac
than tai » thanh tai, toan tai, nhan tai
han tai » hang tai, nhan tai, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu xanh) or (chieu sang)) - hanh trinh thuat hang cong san ((than tai) or (han tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sang)) - hanh trinh thuat hang cong san ((than tai) OR (han tai)).
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sang)) - hanh trinh thuat hang cong san ((than tai) or (han tai))*.