Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
tinh doi » trinh doc, trinh do, tinh hoc
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tinh » may tinh
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
doi su » oi su, don su, voi 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 tinh doi 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 tinh doi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang van)) hoi. hieu va cam xuc va tinh doi su triet*.