Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
ba truc » cau truc, ba trung, dai truc
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
van ba » van ban, van bao, van bac
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: ((thu sach) or (su sach)) ky nang x hoi. thien van ba truc va ((hanh vai) OR (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang x hoi. thien van ba truc va ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang x hoi. thien van ba truc va ((hanh vai) OR (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang x hoi. thien van ba truc va ((hanh vai) OR (hanh va)) cua tre*.