Perhaps you should try some spelling variations:
thien van » thi van
phan dau » phan tu, hang dau
luc phan » duc phan, luc nhan, luan phan
vat cau » va cau, van cau, vat hau
cam luc » cam xuc, cau luc
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
van cam » van nam, van lam, van cau
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: tu sach ((ty nang) OR (ty xang)) x hoi. thien van cam luc phan dau ((vat cau) or (dat cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) x hoi. thien van cam luc phan dau ((vat cau) OR (dat cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) x hoi. thien van cam luc phan dau ((vat cau) or (dat cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) x hoi. thien van cam luc phan dau ((vat cau) or (dat cau)) tren*.