Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu
trong van » trong cac
luan ung » luan hung, luon ung, luan chung
dang van » hoang van, hang va
quan cau » quang cao, toan cau, quan ha

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) or (hoc hien)) sach - hanh trinh luan ung ((dang van) or (trong van)) quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) sach - hanh trinh luan ung ((dang van) OR (trong van)) quan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) sach - hanh trinh luan ung ((dang van) or (trong van)) quan cau*.