Perhaps you should try some spelling variations:
dinh thai » dinh thi, sinh thai, tinh thai
van chat » cao chat
hieu van » hieu va, thien van, lieu va
dinh hai » tinh hai, dinh ha, dinh tai
chat soc » cham soc, chat hoc, chat doc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang ma) OR (tang ma)) hoi. hieu van chat soc va ((dinh hai) or (dinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (tang ma)) hoi. hieu van chat soc va ((dinh hai) OR (dinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) OR (tang ma)) hoi. hieu van chat soc va ((dinh hai) or (dinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) OR (tang ma)) hoi. hieu van chat soc va ((dinh hai) or (dinh thai)) cua tre*.