Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
hien tu » khien tu, dien tu
tu cham » toc cham, thi cham
dung de » dung he, dung dat
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: su sach tru 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: su sach tru nang x ho. hien tu cham duc va ((dan de) OR (dung de)) su triet.
• Adding a wildcard symbol may retrieve word variants: su sach tru nang x ho. hien tu cham duc va ((dan de) or (dung de)) su triet*.