Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va tinh » may tinh
tinh ve » trinh ve, tinh ven, dinh ve
va cao » va cac, va co, va dao
ve cau » ke cau, va cau, ve cac
x hoi » xa hoi, o hoi, x ho

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) or (vu khach)) ky nang x hoi. hieu va cao duc va tinh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky nang x hoi. hieu va cao duc va tinh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang x hoi. hieu va cao duc va tinh ve cau tren*.