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, ca nhan, va phan
cao duc » dao duc, giao duc, tao duoc
cao suc » cao su
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
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: thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve ((cao suc) OR (cao duc)) va nhan vien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve ((cao suc) OR (cao duc)) va nhan vien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve ((cao suc) OR (cao duc)) va nhan vien cua te".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve ((cao suc) OR (cao duc)) va nhan vien cua te*.