Perhaps you should try some spelling variations:
tuan hanh » tuan anh, quan hanh, toan hanh
thu sach » tu sach, thuat sach, thuoc sach
dai truc » dai thuc, doan truc, dai trung
vao truc » vao thuc, cau truc, dao tuc
hieu va » lieu va
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
hanh va » hang va, hanh vi
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 lang xa 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 lang xa hoi. ((hieu va) OR (hieu qua)) ((vao truc) OR (dai truc)) tuan hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty lang xa 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 lang xa hoi. ((hieu va) OR (hieu qua)) ((vao truc) or (dai truc)) tuan hanh va cua tre*.