Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
quan nhung » cua nhung, luan chung, quang hung
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
qua nhung » cua nhung, qua chung, chua nhung
gian bana » gian ban, gian dan, gian lang
cong dan » cong san, cong tan, huong dan

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 (hoc thieu)) sach - hanh trinh ((quan nhung) OR (qua nhung)) cong dan gian bana~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) sach - hanh trinh ((quan nhung) OR (qua nhung)) cong dan gian bana.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc thieu)) sach - hanh trinh ((quan nhung) OR (qua nhung)) cong dan gian bana".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) sach - hanh trinh ((quan nhung) OR (qua nhung)) cong dan gian bana*.