Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
may nong » may cong, may nang, mo nong
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ty nong » tu nong, ty dong, duy nong

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 ((ty nong) or (may nong)) xa hoi. ((hieu va) or (hieu van)) cam duc van hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nong) OR (may nong)) xa hoi. ((hieu va) OR (hieu van)) cam duc van hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nong) or (may nong)) xa hoi. ((hieu va) or (hieu van)) cam duc van hanh hai cua tre*.