Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van dang » van dong, van dung, van nang
van cac » van hac, van cau, van bac
va lang » va nang, hoa lang
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
cua te » cua tu
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) or (v nang)) x hoi. hieu van cac nuoc ((va lang) or (van dang)) tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (v nang)) x hoi. hieu van cac nuoc ((va lang) OR (van dang)) tri cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (v nang)) x hoi. hieu van cac nuoc ((va lang) or (van dang)) tri cua te*.