Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
cham tuc » nham thuc, pham thuc, tham thuc
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cao hoi » cau hoi, cao hoc, tao hoi
ty nang » ky nang, ty xang, ty hang
co hoi » co hoc, co loi
tuc va » thuc va, truc va, tuc xa
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: thu sach ty nang ((cao hoi) or (co hoi)). hieu ve cham tuc va ((hanh vai) or (hanh tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((cao hoi) OR (co hoi)). hieu ve cham tuc va ((hanh vai) OR (hanh tai)) va thiet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((cao hoi) or (co hoi)). hieu ve cham tuc va ((hanh vai) or (hanh tai)) va thiet*.