Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cham tuc » nham thuc, pham thuc, tham thuc
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
tai va » thai va, mai va, tri va
nang o » nang co, nang ho, nang ro
sac ky » cac ky
o hoi » co hoi, o hoc, o hai
thiet » thieu

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 ty) or (sac ky))) or (sai ky)) nang o hoi. hieu van cham tuc va hanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ty) OR (sac ky))) OR (sai ky)) nang o hoi. hieu van cham tuc va hanh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ty) or (sac ky))) or (sai ky)) nang o hoi. hieu van cham tuc va hanh tai va thiet*.