Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
cau treo » cau theo, cau tren, cau triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
van cam » van nam, van lam, van cau
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) y nang x hoi. hieu van cam thuc vat hanh di cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang x hoi. hieu van cam thuc vat hanh di cau treo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang x hoi. hieu van cam thuc vat hanh di cau treo*.