Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
du tren » dua tren, dau tren, duc tren
y nang » ly nang, v nang, may nang
xuc va » duc va, tuc va, luc va
vi du » vi dum, va du, ve du

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) or (ky nang)) xa hoi. hieu van cam xuc va hanh vi du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) xa hoi. hieu van cam xuc va hanh vi du tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) xa hoi. hieu van cam xuc va hanh vi du tren*.