Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
cao hoi » co hoi, cao hoc, tao hoi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
hai van » thai van, ha van, hai tan
tuc va » thuc va, truc va, tuc xa
hai va » thai va, hoi va, mai va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((cao hoi) or (cau hoi)). hieu vu cham tuc va hanh ((hai va) OR (hai van)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((cao hoi) OR (cau hoi)). hieu vu cham tuc va hanh ((hai va) OR (hai van)) thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((cao hoi) or (cau hoi)). hieu vu cham tuc va hanh ((hai va) OR (hai van)) thiet*".