Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thanh doi » thanh loi, thanh moi, thanh do
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
cac duc » cac du, cao duc, cac dac
hieu ve » hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet

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