Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
dau truc » cau truc, dai truc, doan truc
van xanh » van anh, van hanh, van manh
truc van » truc va, thuc van, truc ban
xanh di » danh di, vanh dai, xanh tai
su sach » vu sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ty nang xa hoi. lieu va dau truc van xanh di ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. lieu va dau truc van xanh di ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ty nang xa hoi. lieu va dau truc van xanh di ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty nang xa hoi. lieu va dau truc van xanh di ((cua triet) OR (cua viet))*.