Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thieu sach » chieu sach, thien hach, theo sach
trinh luan » trinh luat, trinh quan, trinh han
dong trong » duong trong, dung trong, cong trong
hieu cach » hieu cac, chieu sach, hieu ca
luan dong » luan cong, quan dong, luan nong
dan than » dan chan, ban than, van than
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (hieu cach)) - hanh trinh luan dong trong ((dan than) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh trinh luan dong trong ((dan than) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - hanh trinh luan dong trong ((dan than) or (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - hanh trinh luan dong trong ((dan than) or (van tuan)) ban*.