Perhaps you should try some spelling variations:
tuan hanh » tuan anh, quan hanh, toan hanh
thu sach » tu sach, thuat sach, thuoc sach
vao truc » vao thuc, cau truc, dao tuc
dang xay » dang van, van xay
dai truc » dai thuc, doan truc, dai trung
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty dang xay hoi. ((hieu va) or (hieu qua)) ((vao truc) or (dai truc)) tuan hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty dang xay hoi. ((hieu va) OR (hieu qua)) ((vao truc) OR (dai truc)) tuan hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty dang xay hoi. ((hieu va) or (hieu qua)) ((vao truc) or (dai truc)) tuan hanh va cua tre*.