Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua viet » ca viet, hoa viet, cua vat
cac duc » cao duc, cac dac, cac nuoc
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang x hoi. hieu qua ((cac duc) or (cac du)) va dan va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang x hoi. hieu qua ((cac duc) OR (cac du)) va dan va cua viet.
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang x hoi. hieu qua ((cac duc) or (cac du)) va dan va cua viet*.