Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhan tai » hang tai, van tai, toan tai
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau treo
va nhan » van nhan, ca nhan, va phan
sach ky » sac ky, sach y, sach ty
dau tuc » dau tu, dao tuc, cau truc
van dau » van dao, phan dau
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ky nang xa hoi. hieu van dau tuc va nhan tai ((((cuu tre) OR (cau tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu van dau tuc va nhan tai ((((cuu tre) OR (cau tren))) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. hieu van dau tuc va nhan tai ((((cuu tre) OR (cau tren))) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu van dau tuc va nhan tai ((((cuu tre) OR (cau tren))) or (cua te))*.