Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
sang mai » sang ma, sang tai, lang mai
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cau tuc » cau truc, cau tu, cau luc
va hanh » va thanh, va danh, ban hanh
y sang » _ sang, duy sang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach y sang mai hoi. ((hieu van) or (hieu va)) cau tuc ((va hanh) or (van hanh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach y sang mai hoi. ((hieu van) OR (hieu va)) cau tuc ((va hanh) OR (van hanh)) vi cua vat.
• Adding a wildcard symbol may retrieve word variants: nuoc sach y sang mai hoi. ((hieu van) or (hieu va)) cau tuc ((va hanh) or (van hanh)) vi cua vat*.