Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cam truc » cau truc, nam truc, lam truoc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat lanh)) ky nang ((x hoi) or (o hoi)). hieu ve cam truc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat lanh)) ky nang ((x hoi) OR (o hoi)). hieu ve cam truc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat lanh)) ky nang ((x hoi) or (o hoi)). hieu ve cam truc va hanh vi cua tre*.