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
danh vi » dinh vi, danh di, danh va
cu tren » tu tren, dua tren
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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 lang xa hoi. hieu van cam ((xuc va) OR (luc 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 ((xuc va) OR (luc va)) ((danh vi) OR (hanh vi)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu van cam ((xuc va) OR (luc 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 ((xuc va) OR (luc va)) ((danh vi) or (hanh vi)) cu tren*.