Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuat lanh)) ky nang ((ma hoi) OR (ma hoa)). hieu van cac duc ban hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat lanh)) ky nang ((ma hoi) OR (ma hoa)). hieu van cac duc ban hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuat lanh)) ky nang ((ma hoi) OR (ma hoa)). hieu van cac duc ban hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat lanh)) ky nang ((ma hoi) OR (ma hoa)). hieu van cac duc ban hanh dai cua tre*.