Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thanh doi » thanh loi, thanh moi, thanh hoai
thanh do » thanh de, thanh pho, thanh hoa
vu sach » vu bach, su sach, vu khach
cac duc » cac du, cao duc, cac dac
duc gia » quoc gia
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 xa hoi. hieu ve cac duc gia ((thanh doi) OR (thanh do)) cua tre~.
• 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 gia ((thanh doi) OR (thanh do)) cua tre.
• 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 gia ((thanh doi) OR (thanh do)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuat san)) ky lang xa hoi. hieu ve cac duc gia ((thanh doi) OR (thanh do)) cua tre*.