Perhaps you should try some spelling variations:
su triet » su viet, ve triet
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
hanh ki » hanh vi, hanh ky, hanh kien
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang xa hoi. hieu va cac ((duc va) or (truc va)) hanh ki ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. hieu va cac ((duc va) OR (truc va)) hanh ki ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu va cac ((duc va) or (truc va)) hanh ki ((su triet) or (su tien))*.