Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) vu nang ma hoi. hieu ve cam xuc ((van thanh) OR (ban thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) vu nang ma hoi. hieu ve cam xuc ((van thanh) OR (ban thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) vu nang ma hoi. hieu ve cam xuc ((van thanh) OR (ban thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) vu nang ma hoi. hieu ve cam xuc ((van thanh) OR (ban thanh)) de cua tre*.