Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
khau sach » hau sach, khoa sach, pham sach
trinh van » trinh han, trinh quan, trinh toan
nang cong » nang song, dang cong, bang cong
dang tran » dang thanh, quang tran, hoang tran
nam sach » ngan sach, nam danh, nam sao
van nang » van quang, van ban, van dong
dan tran » tan tran, dan than, dan toan

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

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