Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
xuc van » duc van, xuc ban, thuc van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
nang ho » nang hoc, tang ho, nang cao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 ky ((nang ho) or (nang co)) hoi. hieu ve cam ((xuc van) or (luc van)) hanh thai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ho) OR (nang co)) hoi. hieu ve cam ((xuc van) OR (luc van)) hanh thai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ho) or (nang co)) hoi. hieu ve cam ((xuc van) or (luc van)) hanh thai cua triet*.