Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
cau phuc » cau truc, chau phu, huu phuc
hieu van » hieu va, thien van, lieu va
doi cua » dai cua, hoi cua
hieu ve » hieu va
cua te » cua tu
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) or (hoc sach)) ky nang o hoi. ((hieu ve) OR (hieu van)) cau phuc van hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (hoc sach)) ky nang o hoi. ((hieu ve) OR (hieu van)) cau phuc van hanh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nuoc sach) or (hoc sach)) ky nang o hoi. ((hieu ve) OR (hieu van)) cau phuc van hanh doi cua te".
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) or (hoc sach)) ky nang o hoi. ((hieu ve) OR (hieu van)) cau phuc van hanh doi cua te*.