Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van chat
tham tuc » tham thuc, thai tuc, nham thuc
nang xa » nang x, lang xa, nang ma
xa dinh » xac dinh, va dinh, ba dinh
dat cua » dai cua, day cua, dan cua
mat cua » ma cua, manh cua, mang cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (nuoc sach)) ky nang xa hoi. thien van tham tuc xa dinh ((dat cua) OR (mat cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (nuoc sach)) ky nang xa hoi. thien van tham tuc xa dinh ((dat cua) OR (mat cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (nuoc sach)) ky nang xa hoi. thien van tham tuc xa dinh ((dat cua) OR (mat cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (nuoc sach)) ky nang xa hoi. thien van tham tuc xa dinh ((dat cua) OR (mat cua)) tre*.