Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xuat ban » luat ban, xuat san, thuat ban
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
xua ban » cua ban, qua ban, mua ban
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ((tu nang) or (tu nong)) xa hoi. hieu van nam ((xua ban) OR (xuat ban)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) xa hoi. hieu van nam ((xua ban) OR (xuat ban)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tu nong)) xa hoi. hieu van nam ((xua ban) OR (xuat ban)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tu nong)) xa hoi. hieu van nam ((xua ban) OR (xuat ban)) hanh di cua tre*.