Perhaps you should try some spelling variations:
cau phuc » cau truc, chau phu, huu phuc
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » hieu qua
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x hoi. ((((hieu ve) or (hieu va))) or (lieu va)) cau phuc va hanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((((hieu ve) OR (hieu va))) OR (lieu va)) cau phuc va hanh vi va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((((hieu ve) or (hieu va))) or (lieu va)) cau phuc va hanh vi va thiet*.