Perhaps you should try some spelling variations:
nam thau » nam thu, nam thai, nam thanh
thau xay » thuat xay, tu xay, phan xay
xay dinh » xac dinh, xuan dinh, xay dung
dinh sai » dinh tai, danh sai, dinh hai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu he » hieu ve, hiem he, hieu le
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang ma) or (sang ma)) hoa. hieu he nam thau xay dinh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (sang ma)) hoa. hieu he nam thau xay dinh sai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) or (sang ma)) hoa. hieu he nam thau xay dinh sai cua tre*.