Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van ban
chat lua » chat cua, chat va, chat huu
van anh » van thanh, tuan anh, van minh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
vu chat » va chat, ve chat, du chat
vi su » va su, ve su, ki su

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