Perhaps you should try some spelling variations:
sach thi » sach tai, sach thieu, sach tham
sach thu » sach thue, sach thieu, sach tham
dieu tra » dieu tri, kiem tra
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
van anh » van thanh, tuan anh, van minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thi) OR (sach thu)) hang xa hoi. hieu va chat va van anh ((dieu cua) or (dieu tra)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thi) OR (sach thu)) hang xa hoi. hieu va chat va van anh ((dieu cua) OR (dieu tra)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thi) OR (sach thu)) hang xa hoi. hieu va chat va van anh ((dieu cua) or (dieu tra)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thi) OR (sach thu)) hang xa hoi. hieu va chat va van anh ((dieu cua) or (dieu tra)) tre*.