Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuat sach, thuoc sach
sach nay » sach hay, sach vay, sach nang
nay dang » nam dang, nao dang, nap dang
cac khoi » cac thoi, cach thoi, hoc khoi
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
hanh di » hanh vi, hanh de, hang di
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach nay dang ((cac khoi) OR (cac khoan)). hieu va pham thuc van hanh di va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach nay dang ((cac khoi) OR (cac khoan)). hieu va pham thuc van hanh di va trien".
• Adding a wildcard symbol may retrieve word variants: thu sach nay dang ((cac khoi) OR (cac khoan)). hieu va pham thuc van hanh di va trien*.