Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh day » hanh may, han day, hanh dao
day cua » dai cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
x hoi » xa hoi, o hoi, x ho

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) OR (sach y)) nang x hoi. hieu van ((cam tuc) or (cam xuc)) va hanh day cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang x hoi. hieu van ((cam tuc) OR (cam xuc)) va hanh day cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) nang x hoi. hieu van ((cam tuc) or (cam xuc)) va hanh day cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) nang x hoi. hieu van ((cam tuc) or (cam xuc)) va hanh day cua tre*.