Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
vi su » va su, ve su, ki 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) or (toc sach))) or (vu sach)) ky nang xa hoi. hieu ve cam xuc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (toc sach))) OR (vu sach)) ky nang xa hoi. hieu ve cam xuc va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (toc sach))) or (vu sach)) ky nang xa hoi. hieu ve cam xuc va hanh vi su triet*.