Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
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
hieu ve » hieu va, hieu van
ve cao » va cao, ve bao, ve cac
suc va » tuc va, luc va, soc va
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: nuoc sach ky ((nang ma) or (tang ma)) hoi. hieu ve cao ((suc va) OR (duc va)) nhan vien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cao ((suc va) OR (duc va)) nhan vien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky ((nang ma) or (tang ma)) hoi. hieu ve cao ((suc va) OR (duc va)) nhan vien cua te".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky ((nang ma) or (tang ma)) hoi. hieu ve cao ((suc va) OR (duc va)) nhan vien cua te*.