Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
cua te » cua tu

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 (su sach)) ky nang x ho. hieu vu cham tuc ((va hanh) or (va tinh)) tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x ho. hieu vu cham tuc ((va hanh) OR (va tinh)) tri cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x ho. hieu vu cham tuc ((va hanh) or (va tinh)) tri cua te*.