Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham tuc » nham thuc, pham thuc, tham thuc
xa thanh » va thanh, ha thanh, ta thanh
thanh do » thanh de, thanh pho, thanh hoa
cua viet » ca viet, hoa viet, cua vat
tu sach » su sach, te sach, tu cach
do cua » doi cua, co cua, de cua
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) OR (thu sach))) or (hoc sach)) ky nang x hoi. hieu van cham tuc xa thanh do cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (hoc sach)) ky nang x hoi. hieu van cham tuc xa thanh do cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (thu sach))) or (hoc sach)) ky nang x hoi. hieu van cham tuc xa thanh do cua viet".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (thu sach))) or (hoc sach)) ky nang x hoi. hieu van cham tuc xa thanh do cua viet*.