Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuat san » thuat toan, thuat song, thuat lanh
thanh doi » thanh loi, thanh moi, thanh do
doi cua » dai cua, hoi cua
cac duc » cao duc, cac dac, cac nuoc
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thuat san)) ky lang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuat san)) ky lang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (thuat san)) ky lang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuat san)) ky lang xa hoi. hieu ve ((cac duc) OR (cac du)) gia thanh doi cua triet*.