Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
tinh voi » trinh voi, tinh doi, binh voi
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
o hoi » co hoi, o hoc, o hai

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 ky nang ((o hoi) or (xa hoi)). hieu van cam tuc va ((tinh voi) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (xa hoi)). hieu van cam tuc va ((tinh voi) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (xa hoi)). hieu van cam tuc va ((tinh voi) or (trinh vi)) cua tre*.