Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cong quang » luong quang, thong quang, duong quang
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong lang » cong vang, cong luong, cong ngang
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh va » trinh van, trinh vat, trinh ve
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - hanh trinh va nhung ((cong lang) or (cong quang)) ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh trinh va nhung ((cong lang) OR (cong quang)) ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh trinh va nhung ((cong lang) or (cong quang)) ((toan cau) or (toan tap))*.