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
cac xuc » cam xuc, cac nuoc, chat xuc
sach vu » sach tu, sach uu, sach xu
mai hoi » mai khoi, dai hoi, lai hoi
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
ki su » ky 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 va)) nang mai hoi. hieu va cac xuc ((van hanh) or (van thanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach va)) nang mai hoi. hieu va cac xuc ((van hanh) OR (van thanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) OR (sach va)) nang mai hoi. hieu va cac xuc ((van hanh) or (van thanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) OR (sach va)) nang mai hoi. hieu va cac xuc ((van hanh) or (van thanh)) ki su triet*.