Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cac dai » cac dan, cac bai, can dai
doi cua » dai cua, hoi cua
cac dac » cac dan, cac bac, cac tac
nang xa » nang x, lang xa, nang ma
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 van ((cac dac) or (cac dai)) ban 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 van ((cac dac) OR (cac dai)) ban thanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat san)) ky nang xa hoi. hieu van ((cac dac) or (cac dai)) ban thanh doi cua tre*.