Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tu cach » tu cac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thuat sach)) ky nang x hoi. hieu va phat ((xuc va) OR (luc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuat sach)) ky nang x hoi. hieu va phat ((xuc va) OR (luc va)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuat sach)) ky nang x hoi. hieu va phat ((xuc va) OR (luc va)) hanh vi cua tre*".