Perhaps you should try some spelling variations:
sinh hoat » sinh hoc, sinh vat
pho thong » he thong
hoat pho » hoat ho, hoc pho, hoa phi
sach dao » lanh dao
tuc bach » truc bach, trac bach, tuc cac
tu sach » thu sach, su sach, te sach
sach xa » sach nha, sach bai
dao tuc » dao duc
bach ha » bac ha, bich ha, sach ha
ha phap » han phap, va phap, ha pha
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach xa hoc sinh hoat pho thong ) or ( tu sach dao tuc bach ha phap tieng ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach xa hoc sinh hoat pho thong ) OR ( tu sach dao tuc bach ha phap tieng )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach xa hoc sinh hoat pho thong ) or ( tu sach dao tuc bach ha phap tieng ))*.