Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao
di su » doi su, da su, de su
ki su » ky su

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 xa) or (lang van)) hoi. hieu va cam xuc va hanh ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang van)) hoi. hieu va cam xuc va hanh ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang van)) hoi. hieu va cam xuc va hanh ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang van)) hoi. hieu va cam xuc va hanh ((di su) OR (ki su)) triet*.