Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
nang dai » nang dau, nang tai, lang dai
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
sach va » sach ha, sach dao, sach nha
sach xa » sach dao, sach nha, sach bai
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, ban hanh
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach va) OR (sach xa)) nang dai hoc. hieu va pham thuc va hanh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach va) OR (sach xa)) nang dai hoc. hieu va pham thuc va hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: co ((sach va) OR (sach xa)) nang dai hoc. hieu va pham thuc va hanh vai cua viet*.