Perhaps you should try some spelling variations:
ve triet » va trien, su triet
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
tu sach » thu sach, su sach, te sach
ki ve » ke ve, gi ve, vi ve

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 mai hoi. hieu va ((cham duc) OR (pham duy)) va hanh ki ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang mai hoi. hieu va ((cham duc) OR (pham duy)) va hanh ki ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang mai hoi. hieu va ((cham duc) OR (pham duy)) va hanh ki ve triet*.