Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thanh hoi » thanh hoai, thanh hoa, thanh hai
su sach » so sach, vu sach
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
dac va » duc va, dat va, dai va
ve cac » va cac, vien cac

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 ve cac ((dac va) OR (day va)) thanh hoi 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 ve cac ((dac va) OR (day va)) thanh hoi 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 ve cac ((dac va) OR (day va)) thanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat san)) ky nang xa hoi. hieu ve cac ((dac va) OR (day va)) thanh hoi cua tre*.