Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, hieu ve
thai cua » than cua, tai cuc, tri cua
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty hang, ly nang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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 ((ty nang) or (ty xang)) xa hoi. ((hieu van) OR (lieu va)) bac duc va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu van) OR (lieu va)) bac duc va hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty nang) or (ty xang)) xa hoi. ((hieu van) OR (lieu va)) bac duc va hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) or (ty xang)) xa hoi. ((hieu van) OR (lieu va)) bac duc va hanh thai cua tre*.