Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
o hoc » co hoc, mo hoc, so hoc

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 ((o hoc) or (xa hoi)). lieu va nam xuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((o hoc) OR (xa hoi)). lieu va nam xuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((o hoc) or (xa hoi)). lieu va nam xuc va hanh di cua tre*.