Perhaps you should try some spelling variations:
thuyet tach » thuyet mach, thuyet xac, thuyet cac
thuyet hach » thuyet mach, thuyet xac, thuyet cac
nhung chong » nhung cong, nhung phong, nhung phuong
hanh trinh » canh tranh, hanh chinh
luat nhung » luat chung, luat thuong, thuat nhung
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuyet tach) OR (thuyet hach)) - hanh trinh luat nhung chong ((van tan) or (von tai)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuyet tach) OR (thuyet hach)) - hanh trinh luat nhung chong ((van tan) OR (von tai)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuyet tach) OR (thuyet hach)) - hanh trinh luat nhung chong ((van tan) or (von tai)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuyet tach) OR (thuyet hach)) - hanh trinh luat nhung chong ((van tan) or (von tai)) ban*.