Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, gia thanh
ta thanh » tai thanh, va thanh, ha thanh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cac tuc » cac toc, cac tu, cac tac
doi cua » dai cua
hoi cua » hoi chuc
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. lieu va cac tuc ((xa thanh) or (ta thanh)) ((doi cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. lieu va cac tuc ((xa thanh) OR (ta thanh)) ((doi cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. lieu va cac tuc ((xa thanh) or (ta thanh)) ((doi cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. lieu va cac tuc ((xa thanh) or (ta thanh)) ((doi cua) OR (hoi cua)) tre*.