Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
cu tren » tu tren, dua tren
xuc va » duc va, tuc va, luc 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 ky nang mai hoi. hieu van cam xuc va ((hanh tai) or (hanh vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai hoi. hieu van cam xuc va ((hanh tai) OR (hanh vi)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai hoi. hieu van cam xuc va ((hanh tai) or (hanh vi)) cu tren*.