Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
cham tuc » pham thuc, tham thuc, cham soc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
di cua » dai cua, doi cua, de cua

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 ((y nang) OR (v nang)) xa hoi. lieu va ((cham tuc) or (nham thuc)) va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. lieu va ((cham tuc) OR (nham thuc)) va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) xa hoi. lieu va ((cham tuc) or (nham thuc)) va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) xa hoi. lieu va ((cham tuc) or (nham thuc)) va hanh di cua viet*.