Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » thuoc sach, thu hoach, khau sach
cua viet » ca viet, hoa viet, cua vat
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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) or (((thu sach) OR (thuat sach)))) ky nang xa hoi. lieu va cam tuc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thuat sach)))) ky nang xa hoi. lieu va cam tuc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thuat sach)))) ky nang xa hoi. lieu va cam tuc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thuat sach)))) ky nang xa hoi. lieu va cam tuc va hanh di cua viet*.