Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach tru » sach truc, sach tu, sach tren
cham duc » pham duc, cham soc, pham duy
sach thu » sach thue, sach thieu, sach tham
dung de » dung he, dung dat
hien tu » khien tu, dien tu
tu cham » toc cham, thi cham
dan de » dan den, dang de, van de

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 tru) OR (sach thu)) nang x ho. hien tu cham duc va ((dan de) or (dung de)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tru) OR (sach thu)) nang x ho. hien tu cham duc va ((dan de) OR (dung de)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tru) OR (sach thu)) nang x ho. hien tu cham duc va ((dan de) or (dung de)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tru) OR (sach thu)) nang x ho. hien tu cham duc va ((dan de) or (dung de)) su triet*.