Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, tu cach
te sach » toc sach
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
hanh ki » hanh vi, hanh ky, hanh kien
va cam » va cham, va cac, va cao
kem » kiem

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