Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di 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 ky ((nang x) or (sang ma)) hoi. thien van cau ((tuc xa) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang x) OR (sang ma)) hoi. thien van cau ((tuc xa) OR (tuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang x) or (sang ma)) hoi. thien van cau ((tuc xa) or (tuc va)) hanh vi cua tre*.