Perhaps you should try some spelling variations:
thien van » thi van
van cham » van chat, van tham, va cham
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
dat cua » dai cua, day cua, mat cua
truc va » thuc va, trung va
toc sac » toc san, hoc sach, doc sach
cua tre » cua te, cuu tre, cua triet
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: ((toc sac) OR (toc sach)) ky nang x hoi. thien van cham ((truc va) or (thuc vat)) dinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc sach)) ky nang x hoi. thien van cham ((truc va) OR (thuc vat)) dinh dat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc sach)) ky nang x hoi. thien van cham ((truc va) or (thuc vat)) dinh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc sach)) ky nang x hoi. thien van cham ((truc va) or (thuc vat)) dinh dat cua tre*.