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

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