Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
tang ma » mang may, tang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty ((tang ma) or (((lang xa) or (dang xay)))) hoi. hieu va cac duc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((tang ma) OR (((lang xa) OR (dang xay)))) hoi. hieu va cac duc va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((tang ma) or (((lang xa) or (dang xay)))) hoi. hieu va cac duc va thanh dai cua tre*.