Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
cua triet » cua viet, su triet, va triet
thien cac » hien cac, thien cau, thieu cac
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
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, dao va
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 thien cac ((lao va) OR (bao 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 thien cac ((lao va) OR (bao 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 thien cac ((lao va) OR (bao va)) danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu thien cac ((lao va) OR (bao va)) danh vai cua triet*.