Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
van nang » van quang, van ban, van dong
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
va cam » va cham, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) van nang xa hoi. hieu ((va cam) or (va cac)) xuc van hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) van nang xa hoi. hieu ((va cam) OR (va cac)) xuc van hanh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) van nang xa hoi. hieu ((va cam) or (va cac)) xuc van hanh va su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) van nang xa hoi. hieu ((va cam) or (va cac)) xuc van hanh va su triet*.