Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
chu duc » thu duc, chua duoc, cuu duoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang ma hoi. ((hieu ve) or (lieu va)) chu duc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoi. ((hieu ve) OR (lieu va)) chu duc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang ma hoi. ((hieu ve) or (lieu va)) chu duc van hanh di cua tre*.