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
hanh du » hanh dua, hanh tu, hanh de
cua tre » cua te, cuu tre, cua triet
xu van » tu van, vu van, su van
du cua » duy cua, dau cua, dum cua
xu va » tu va, su va, vu 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 hanh ((xu va) OR (xu van)) hanh du 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 hanh ((xu va) OR (xu van)) hanh du 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 hanh ((xu va) OR (xu van)) hanh du cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) xa hoi. hieu van hanh ((xu va) OR (xu van)) hanh du cua tre*.