Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
sach nay » sach hay, sach vay, sach nang
thu sach » tu sach, thuat sach, thuoc sach
cac khoi » cac thoi, cac khoan, cach thoi
dang cac » dung cac, bang cac, dong cac
nay dang » nam dang, nao dang, nap dang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
dai va » mai va
di va » di vao, doi va, di vat

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