Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, gian cac
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
vien da » vien dai, hien dai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
lao va » tao va, cao va, bao 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)) lao va danh vai cua 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)) lao va danh vai cua 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)) lao va danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu ((vien cac) OR (vien da)) lao va danh vai cua triet*.