Perhaps you should try some spelling variations:
nhan viet » nhan vien, han viet, nhin viet
viet cua » viec cua, viet ca, viet qua
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va nhan » van nhan, ca nhan, va phan
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
cua te » cua tu
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sac ky)) nang xa hoi. hieu ve cao su va nhan viet cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao su va nhan viet cua te.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sac ky)) nang xa hoi. hieu ve cao su va nhan viet cua te*.