Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
trung va » truong va, trang va, trung ha
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc va) OR (trung va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang xa hoi. ((hieu ve) OR (hieu va)) cau ((truc va) OR (trung va)) hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc va) OR (trung va)) hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc va) OR (trung va)) hanh dai cua tre*.