Perhaps you should try some spelling variations:
trinh voi » trinh hoi, trinh vi, trinh boi
hieu van » hieu va, thien van, hieu ve
va trinh » van trinh, va tinh, lap trinh
chat xuc » chat huu, cam xuc, chao xu
voi cua » hoi cua, doi cua, moi cua
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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 ((lang xa) or (nang ma)) hoi. ((hieu van) OR (lieu va)) chat xuc va trinh voi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((lang xa) OR (nang ma)) hoi. ((hieu van) OR (lieu va)) chat xuc va trinh voi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang xa) or (nang ma)) hoi. ((hieu van) OR (lieu va)) chat xuc va trinh voi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((lang xa) or (nang ma)) hoi. ((hieu van) OR (lieu va)) chat xuc va trinh voi cua tre*.