Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
van hang » van khang, van hoang, van thang
phuc van » thuc van, phuc va, chuc van
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
ve cau » va cau, ve cac, le cau
y nang » ky nang, ly nang, may nang
ke cau » ket cau
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua

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 ((y nang) or (v nang)) xa hoi. hieu ((ve cau) OR (ke cau)) phuc van hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((y nang) OR (v nang)) xa hoi. hieu ((ve cau) OR (ke cau)) phuc van hang di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ((y nang) or (v nang)) xa hoi. hieu ((ve cau) OR (ke cau)) phuc van hang di cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((y nang) or (v nang)) xa hoi. hieu ((ve cau) OR (ke cau)) phuc van hang di cua tre*.