Perhaps you should try some spelling variations:
thien van » thi van
cach cua » mach cua, cac cua, cach dua
sach ky » sac ky, sach ty, sach kem
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sach y)) nang ma hoi. thien van cam ((luc va) OR (loc va)) tinh cach cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) nang ma hoi. thien van cam ((luc va) OR (loc va)) tinh cach cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sach y)) nang ma hoi. thien van cam ((luc va) OR (loc va)) tinh cach cua tre*".