Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
hanh ki » hanh vi, hanh ky, hanh kien
y nang » ky nang, ly nang, v nang
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: ((su sach) or (so sach)) y nang xa hoi. lieu va cac ((duc va) or (truc va)) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. lieu va cac ((duc va) OR (truc va)) hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. lieu va cac ((duc va) or (truc va)) hanh ki su triet*.