Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh van » thanh van, khanh van, hanh san
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
van cau » van dau, van hau, van chat
cau tac » cau thac, cau tao, cuu tac
tac xa » tuc xa, tac da
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 ty nang o hai. hieu van cau tac xa ((hanh va) or (hanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hai. hieu van cau tac xa ((hanh va) OR (hanh van)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hai. hieu van cau tac xa ((hanh va) or (hanh van)) su triet*.