Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
tinh dam » tinh nam, tinh da, tinh dau
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
va tinh » may tinh
dam cua » dai cua, day cua, nam cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (su sach)) ly nang xa hoi. hieu van cac luc va tinh dam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (su sach)) ly nang xa hoi. hieu van cac luc va tinh dam cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (su sach)) ly nang xa hoi. hieu van cac luc va tinh dam cua tre*.