Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
su tien » su kien, su hien, tu tieng
ve cac » va cac, vien cac
ca su » cua su, cao su, ca sau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((nang xa) OR (nang ma)) hoi. hieu ve cac duc va danh ca su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((nang xa) OR (nang ma)) hoi. hieu ve cac duc va danh ca su tien".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang xa) OR (nang ma)) hoi. hieu ve cac duc va danh ca su tien*.