Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac lop » cac hop, cac loai
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
lop va » lap va, hop va, nop va
va dau » va dao
dau vi » dau ve, dau va, dat vi
vi cua » vai cua, di cua

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 sach) or (thuat san)))) ky nang xa hoi. hieu ve cac lop va dau vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((thuat sach) OR (thuat san)))) ky nang xa hoi. hieu ve cac lop va dau vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((thuat sach) or (thuat san)))) ky nang xa hoi. hieu ve cac lop va dau vi cua tre*.