Perhaps you should try some spelling variations:
vien cua » viec cua, dien cua, tien cua
thu sac » thu sach, thu san, thu xac
va nhan » van nhan, va phan, va nha
cao tuc » dao tuc, cao duc, cao suc
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang xa) or (sang ma)) hoi. hieu ve cao tuc ((va nhan) OR (ca nhan)) vien cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (sang ma)) hoi. hieu ve cao tuc ((va nhan) OR (ca nhan)) vien cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((nang xa) or (sang ma)) hoi. hieu ve cao tuc ((va nhan) OR (ca nhan)) vien cua su".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (sang ma)) hoi. hieu ve cao tuc ((va nhan) OR (ca nhan)) vien cua su*.