Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
truc va » thuc va, trung va
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
san ly » van ly, ban ly
ve cau » ke cau, va cau, ve cac
o hai » co hai, so hai, o lai
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 san ly nang ((x hoi) or (o hai)). hieu ve cau ((truc va) OR (thuc vat)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ly nang ((x hoi) OR (o hai)). hieu ve cau ((truc va) OR (thuc vat)) hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ly nang ((x hoi) or (o hai)). hieu ve cau ((truc va) OR (thuc vat)) hanh vai cua tre*".