Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hang » ngan hang
cam tuc » cam xuc, cam tu, nam thuc
vu sach » vu bach, su sach, vu khach
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
cong ha » cong hoa, dong ha, cong tac
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach lo ((nang x) or (cong ha)) hoi. hieu va cam tuc ((ban hanh) or (ban hang)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach lo ((nang x) OR (cong ha)) hoi. hieu va cam tuc ((ban hanh) OR (ban hang)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach lo ((nang x) or (cong ha)) hoi. hieu va cam tuc ((ban hanh) or (ban hang)) vi su triet*.