Perhaps you should try some spelling variations:
tinh ven » trinh ven, tinh yen, sinh vien
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
dao duc » giao duc, tao duoc
tinh ve » trinh ve, dinh ve, tinh va
cu tren » tu tren, dua tren
hieu va » lieu va, hieu qua
va dao » ca dao
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: ((vu sach) or (vu khach)) ky nang x hoi. hieu va dao duc va ((tinh ve) OR (tinh ven)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang x hoi. hieu va dao duc va ((tinh ve) OR (tinh ven)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang x hoi. hieu va dao duc va ((tinh ve) OR (tinh ven)) cu tren".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang x hoi. hieu va dao duc va ((tinh ve) OR (tinh ven)) cu tren*.