Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
van hang » van khang, van hoang, van thang
van than » van thanh, van thang, van tuan
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
don su » dong su, down su, dan su

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 v nang xa hoi. hieu qua cac truc ((van hang) or (van than)) don su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu qua cac truc ((van hang) OR (van than)) don su triet.
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu qua cac truc ((van hang) or (van than)) don su triet*.