Perhaps you should try some spelling variations:
thien van » thi van
sach ty » sach y, sach tu, sach thu
mai van » mai va, hai van, mai quan
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
ma van » va van, ha van
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 ty ((nang xa) or (nang ma)) hoi. thien van nam ((ma van) OR (mai van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang ma)) hoi. thien van nam ((ma van) OR (mai van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang ma)) hoi. thien van nam ((ma van) OR (mai van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang ma)) hoi. thien van nam ((ma van) OR (mai van)) hanh vi cua tre*.