Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
danh vi » dinh vi, danh di, danh va
cu tren » tu tren, dua tren

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