Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
xuc va » luc va, xac va
tuc va » thuc va, truc va, tuc xa
di va » dai va, di vao, doi va

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 y nang mai khoi. hieu va cac ((((xuc va) or (tuc va))) or (duc va)) hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang mai khoi. hieu va cac ((((xuc va) OR (tuc va))) OR (duc va)) hanh di va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai khoi. hieu va cac ((((xuc va) or (tuc va))) or (duc va)) hanh di va triet*.