Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » van thanh, tuan anh, van minh
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 nang ma hoi. hieu va cac xuc ((van hanh) or (van anh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang ma hoi. hieu va cac xuc ((van hanh) OR (van anh)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang ma hoi. hieu va cac xuc ((van hanh) or (van anh)) ki su triet*.