Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
ly hang » ly quang
hanh xu » hanh tu, hanh sua, hanh cua
cua tre » cua te, cuu tre, cua triet
dao di » dao do, dao du, dao li
di cua » dai cua, doi cua, de cua
xu ca » xu cam, xu cua, xu co

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 (ly hang))) or (ky nang)) xa hoi. hieu van hanh xu ca dao di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((ty nang) OR (ly hang))) OR (ky nang)) xa hoi. hieu van hanh xu ca dao di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((((ty nang) or (ly hang))) or (ky nang)) xa hoi. hieu van hanh xu ca dao di cua tre*.