Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
van nhan » van phan, van thanh, danh nhan
vien cua » viec cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
qua cao » qua cac, qua ca, qua cai
cao tuc » dao tuc, cao duc, cao suc
va nhan » ca nhan, va phan, va nha
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: nguoi sach ky ((nang ma) or (tang ma)) hoi. hieu qua cao tuc ((va nhan) OR (van nhan)) vien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach ky ((nang ma) OR (tang ma)) hoi. hieu qua cao tuc ((va nhan) OR (van nhan)) vien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nguoi sach ky ((nang ma) or (tang ma)) hoi. hieu qua cao tuc ((va nhan) OR (van nhan)) vien cua te".
• Adding a wildcard symbol may retrieve word variants: nguoi sach ky ((nang ma) or (tang ma)) hoi. hieu qua cao tuc ((va nhan) OR (van nhan)) vien cua te*.