Perhaps you should try some spelling variations:
trinh hoi » trinh hoa, trinh do, trinh han
va trinh » van trinh, va tinh, lap trinh
hieu van » hieu va, thien van, hieu ve
sach ty » sach y, sach tu, sach thu
hoi cua » hoi chuc
su sach » so sach, vu 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
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: su sach ty ((nang xa) or (nang ma)) hoi. ((hieu van) or (lieu va)) cam xuc va trinh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. ((hieu van) OR (lieu va)) cam xuc va trinh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang ma)) hoi. ((hieu van) or (lieu va)) cam xuc va trinh hoi cua tre*.