Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
sach tran » sach tranh, sach tren, vach tran
tran chai » tran chau, tran hai, tran chi
chai khoa » thai khoa, chi khoa, pham khoa
xin chan » dan chan, can chan, giu chan
ban chan » dan chan, ban than, ban nhan
khoa hoc » hoa hoc
thu xac » thau xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu xac ((xin chan) or (ban chan)) khoa hoc ) or ( nguoi sach tran chai khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu xac ((xin chan) OR (ban chan)) khoa hoc ) OR ( nguoi sach tran chai khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thu xac ((xin chan) or (ban chan)) khoa hoc ) or ( nguoi sach tran chai khoa hoc ))*.