Perhaps you should try some spelling variations:
sach tham » sach nha
nham thuc » nhan thuc, nam thuc, nham thu
khau viet » khoan viet, phap viet, hai viet
sach thu » sach thue, sach thieu, cach thuc
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
hanh lai » hanh lam, hanh tai, thanh lap
lai khau » lai chau, tai khu, cau khau
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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: vu ((sach thu) OR (sach tham)) nang x hoi. hieu van nham thuc va hanh lai khau viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach thu) OR (sach tham)) nang x hoi. hieu van nham thuc va hanh lai khau viet".
• Adding a wildcard symbol may retrieve word variants: vu ((sach thu) OR (sach tham)) nang x hoi. hieu van nham thuc va hanh lai khau viet*.