Perhaps you should try some spelling variations:
thieu nien » thien nhien
thuat sach » thuat lanh, thuat san
dang xay » dang van, van xay
nien dau » nhien dai, chien dau, hien dai
dau luoc » dau nuoc, dai luoc, dau luot
luoc van » luoc can, luoc va, luc van
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ty dang xay hoi. thieu nien dau luoc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ty dang xay hoi. thieu nien dau luoc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ty dang xay hoi. thieu nien dau luoc van hanh tai cua tre*.