Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nam truoc » nam thuoc, lam truoc, nam truc
truoc va » truc va, thuoc va, truong va
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay

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)) ky nang xa hoi. hieu va nam truoc va ((dan vai) OR (dan vat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang xa hoi. hieu va nam truoc va ((dan vai) OR (dan vat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat sach)) ky nang xa hoi. hieu va nam truoc va ((dan vai) OR (dan vat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang xa hoi. hieu va nam truoc va ((dan vai) OR (dan vat)) cua tre*.