Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
uoc va » nuoc va, duoc va, quoc va
loc va » hoc va, luc va
di cua » dai cua, doi cua, de 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: ((thuat sach) OR (thuat lanh)) y nang x hoi. lieu va cham ((uoc va) or (loc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) y nang x hoi. lieu va cham ((uoc va) OR (loc va)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat lanh)) y nang x hoi. lieu va cham ((uoc va) or (loc va)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) OR (thuat lanh)) y nang x hoi. lieu va cham ((uoc va) or (loc va)) hanh di cua tre*.