Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca 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 xa) OR (nang ma)) hoi. thi van cam ((xuc va) or (hoc dan)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. thi van cam ((xuc va) OR (hoc dan)) hanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang ma)) hoi. thi van cam ((xuc va) or (hoc dan)) hanh va cua tre*".