Perhaps you should try some spelling variations:
"te sach trien tri" » "te sach tien tri", "te sach tren tri", "te cach thien tri", "te sach trien thi", "te sach trieu thi", "toc sach trien tri"
"hoc sach tham tai" » "hoc sach nha tai", "hoc sinh tham tai", "hoc cac tham tai", "hoc anh tham tai", "hoc sach pham tai", "hoc sach thai tai", "hoc sach thap tai"
"thu sach thieu tri" » "thu sach thieu tai", "thu sach dieu tri", "thu sach thieu nhi", "tu sach thieu tri", "thuat sach thieu tri", "thuoc sach thieu tri"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("hoc sach tham tai") or ((("te sach trien tri") or ("thu sach thieu tri"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("hoc sach tham tai") OR ((("te sach trien tri") OR ("thu sach thieu tri"))))*.
• Removing quotes may allow a broader search: (( hoc sach tham tai ) or ((( te sach trien tri ) or ( thu sach thieu tri ))))*.