Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xa danh » va danh, dia danh, nam danh
doi cua » dai cua, dong cua
hoi cua » hoi chuc

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)) ky nang x ho. hieu vu cham tuc xa danh ((doi cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x ho. hieu vu cham tuc xa danh ((doi cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x ho. hieu vu cham tuc xa danh ((doi cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x ho. hieu vu cham tuc xa danh ((doi cua) OR (hoi cua)) tre*.