Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cham tuc » nham thuc, pham thuc, tham thuc
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
cao hoi » cau hoi, co hoi, cao hoc
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
tuc va » thuc va, truc va, tuc xa
vai va » mai va, dai va, hai va
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) or (ty hang)) cao hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty hang)) cao hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) or (ty hang)) cao hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty hang)) cao hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vai va thiet*.