Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tri nang » thi nang, tra nang, tri bang
va triet » va thiet, va trien, ve triet
tru nang » tra nang, truc nano, thi nang
hieu va » lieu va, hieu qua
va dich » van dich
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
o hoi » co hoi, o hoc, o hai
vu va » vu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((tru nang) OR (tri nang)) ((xa hoi) or (o hoi)). hieu va cam xuc va dich vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((tru nang) OR (tri nang)) ((xa hoi) OR (o hoi)). hieu va cam xuc va dich vu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((tru nang) OR (tri nang)) ((xa hoi) or (o hoi)). hieu va cam xuc va dich vu va triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((tru nang) OR (tri nang)) ((xa hoi) or (o hoi)). hieu va cam xuc va dich vu va triet*.