Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thuat san » thuat toan, thuat song, thuat lanh
cua triet » cua viet, su triet, va triet
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc gia » quoc gia
ve cac » va cac, vien cac

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