Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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