Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
chat lua » chat cua, chat huu, chat hoa
hanh ve » hanh vi, hanh va, hanh kem
tu sach » thu sach, su sach, te sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
hieu vu » hieu va, hieu ve, hieu su
ve ve » de ve, va ve, ke ve

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 ((ly nang) OR (ly hang)) xa hoi. hieu vu ((chat lua) or (chat va)) van hanh ve ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) xa hoi. hieu vu ((chat lua) OR (chat va)) van hanh ve ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ly hang)) xa hoi. hieu vu ((chat lua) or (chat va)) van hanh ve ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ly hang)) xa hoi. hieu vu ((chat lua) or (chat va)) van hanh ve ve triet*.