Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
hau duc » huu duc, ha duc, pham duc
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
de cua » le cua, te cua, dieu cua

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