Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham tuc » nham thuc, pham thuc, tham thuc
va cham » va chat, va tham
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
cu tren » tu tren, dua tren
y nang » ly nang, v nang, may nang
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((y nang) or (ky nang)) xa hoi. lieu va cham tuc va ((hanh di) OR (hang di)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (ky nang)) xa hoi. lieu va cham tuc va ((hanh di) OR (hang di)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y nang) or (ky nang)) xa hoi. lieu va cham tuc va ((hanh di) OR (hang di)) cu tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) or (ky nang)) xa hoi. lieu va cham tuc va ((hanh di) OR (hang di)) cu tren*.