Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
cham luc » nhan luc, cham cuu, chat lua
van hanh » ban hanh, van anh, van ban
sach vu » sach va, sach tu, sach uu
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
vu sang » vua sang, vu dang, vu san
ma hoi » mai hoi, xa hoi, ma hoa
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 sang ma hoi. hieu va ((cham luc) or (cham soc)) ((van hanh) OR (van thanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu sang ma hoi. hieu va ((cham luc) OR (cham soc)) ((van hanh) OR (van thanh)) ki su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu sang ma hoi. hieu va ((cham luc) or (cham soc)) ((van hanh) OR (van thanh)) ki su triet*".