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
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac dac » cac dai, cac bac, cac tac
doi cua » dai cua, hoi cua, dong cua
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: ((su sach) or (thuat san)) ky nang xa hoi. hieu va ((cac dac) OR (cac dan)) va thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat san)) ky nang xa hoi. hieu va ((cac dac) OR (cac dan)) va thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuat san)) ky nang xa hoi. hieu va ((cac dac) OR (cac dan)) va thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat san)) ky nang xa hoi. hieu va ((cac dac) OR (cac dan)) va thanh doi cua tre*.