Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » thien van, lieu va, hieu ve
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
da duoc » tao duoc, hoa duoc
duoc ma » duoc lam
ma hanh » va hanh, da hanh, na hanh
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: ((te sach) or (thuat san)) ky nang xa hoi. ((hieu van) OR (hieu va)) da duoc ma hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat san)) ky nang xa hoi. ((hieu van) OR (hieu va)) da duoc ma hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat san)) ky nang xa hoi. ((hieu van) OR (hieu va)) da duoc ma hanh dai cua tre*".