Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hanh trinh » canh tranh, hanh chinh
thu phuong » thi phuong, thu huong, theo phuong
nhung cong » dung cong, thong cong, hang cong
hien sach » kien sach, thien hach, chieu sach
dien sach » dien anh
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (dien sach)) - hanh trinh quan ((thu phuong) or (nhung cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien sach)) - hanh trinh quan ((thu phuong) OR (nhung cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (dien sach)) - hanh trinh quan ((thu phuong) or (nhung cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (dien sach)) - hanh trinh quan ((thu phuong) or (nhung cong)) dan toan ban*.