Perhaps you should try some spelling variations:
nganh xay » nganh mac, nganh y, nganh ma
toc sach » hoc sach, doc sach, thuoc sach
manh dai » manh hai, vanh dai, manh khai
ban manh » ban hanh, van manh, ban mach
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
anh xay » manh xay, anh hay, dang xay
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: toc sach ky ((anh xay) or (nganh xay)) hoi. ((hieu ve) or (hieu va)) cac duc ban manh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((anh xay) OR (nganh xay)) hoi. ((hieu ve) OR (hieu va)) cac duc ban manh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((anh xay) or (nganh xay)) hoi. ((hieu ve) or (hieu va)) cac duc ban manh dai cua tre*.