Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
van hanh » ban hanh, van anh, van ban
nang mai » nang ma, nang tai, lang mai
cam luc » cam xuc, cau luc
kien su » nien su, tien su, vien sau
sach va » sach xa, sach ha, sach dao
mai hoi » mai khoi, dai hoi, lai hoi
sach uu » sach luu, sach tu, sach xu
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 va) or (sach uu)) nang mai hoi. hieu va cam luc ((van hanh) OR (van thanh)) kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach va) OR (sach uu)) nang mai hoi. hieu va cam luc ((van hanh) OR (van thanh)) kien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach va) or (sach uu)) nang mai hoi. hieu va cam luc ((van hanh) OR (van thanh)) kien su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach va) or (sach uu)) nang mai hoi. hieu va cam luc ((van hanh) OR (van thanh)) kien su triet*.