Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cach tu » cach thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cac du, tac tu
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 lanh)) ky nang xa hoi. hieu va ((cac tu) OR (cach tu)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat lanh)) ky nang xa hoi. hieu va ((cac tu) OR (cach tu)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat lanh)) ky nang xa hoi. hieu va ((cac tu) OR (cach tu)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat lanh)) ky nang xa hoi. hieu va ((cac tu) OR (cach tu)) va hanh vi cua tre*.