Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, hoc hien, hoc dieu
trinh cua » tinh cua, trinh luat, trinh quan
nang cong » nang song, dang cong, bang cong
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
vang van » dang van, tang van, lang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) OR (ho chieu)) sach - hanh trinh cua ((nang cong) or (hang cong)) vang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (ho chieu)) sach - hanh trinh cua ((nang cong) OR (hang cong)) vang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (ho chieu)) sach - hanh trinh cua ((nang cong) or (hang cong)) vang van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (ho chieu)) sach - hanh trinh cua ((nang cong) or (hang cong)) vang van ban*.