Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vien cac » vien bach, vien dai, gian cac
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
vien da » vien dai, hien dai
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
tu sach » thu sach, su sach, te sach
bao va » bao ve, tao va, ban va

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 (vu sach)) ky nang xa hoi. hieu ((vien cac) OR (vien da)) bao va tinh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu ((vien cac) OR (vien da)) bao va tinh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu ((vien cac) OR (vien da)) bao va tinh va su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu ((vien cac) OR (vien da)) bao va tinh va su triet*.