Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh dau » hang dau, danh dau, han dau
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hanh su » hanh sua, hinh su, hanh tu
va hanh » van hanh, va thanh, va danh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) or (ky nang)) xa hoi. ((hieu van) OR (thien van)) hanh su va hanh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. ((hieu van) OR (thien van)) hanh su va hanh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ky nang)) xa hoi. ((hieu van) OR (thien van)) hanh su va hanh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) xa hoi. ((hieu van) OR (thien van)) hanh su va hanh dau cua tre*.