Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
tinh voi » trinh voi, tinh doi, binh voi
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
tinh vi » trinh vi, tinh va, dinh vi
tuc va » thuc va, truc va, tuc xa
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: ((su sach) or (co sach)) ky nang x hoi. hieu vu cham tuc va ((tinh vi) OR (tinh voi)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang x hoi. hieu vu cham tuc va ((tinh vi) OR (tinh voi)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang x hoi. hieu vu cham tuc va ((tinh vi) OR (tinh voi)) cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang x hoi. hieu vu cham tuc va ((tinh vi) OR (tinh voi)) cua vat*.