Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
nang mai » nang ma, nang tai, lang mai
sach vu » sach va, sach tu, sach xu
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
sach uu » sach luu, sach tu, sach xu
su tien » su kien, su hien, tu tieng
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: tu ((sach vu) OR (sach uu)) nang mai hoi. hieu va cam xuc ((van hanh) or (ban hanh)) vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach uu)) nang mai hoi. hieu va cam xuc ((van hanh) OR (ban hanh)) vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) OR (sach uu)) nang mai hoi. hieu va cam xuc ((van hanh) or (ban hanh)) vi su tien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) OR (sach uu)) nang mai hoi. hieu va cam xuc ((van hanh) or (ban hanh)) vi su tien*.