Perhaps you should try some spelling variations:
tinh voi » trinh voi, tinh doi, binh voi
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
voi cua » hoi cua, doi cua, moi cua
va tinh » may tinh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, mang may
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet

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) or (nang cao)))) hoi. hieu van cau duc va tinh voi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (((nang ma) OR (nang cao)))) hoi. hieu van cau duc va tinh voi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (((nang ma) or (nang cao)))) hoi. hieu van cau duc va tinh voi cua tre*.