Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhan thong » nhan trong, nha thong, nhan khong
cong luong » cong thuong, nang luong, cong dong
hieu manh » chieu xanh, hieu nganh, dieu hanh
nhan tong » nhan trong, nhan tuong, han tong
luong van » luong va, duong van, luong vat
hoc hieu » hoc thieu, hoc hien, doc hieu

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) or (canh tranh)) ((nhan tong) OR (nhan thong)) cong luong van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh trinh) OR (canh tranh)) ((nhan tong) OR (nhan thong)) cong luong van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh trinh) or (canh tranh)) ((nhan tong) OR (nhan thong)) cong luong van ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh trinh) or (canh tranh)) ((nhan tong) OR (nhan thong)) cong luong van ban*.