Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
hanh lam » thanh lap, hanh kem, hanh va
nam truc » nam truoc, nam thuc, nam trung
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
hanh em » hanh kem, anh em, hanh nam
vu sach » vu bach, su sach, vu khach
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 van nang x hoi. hieu van ((cau truc) or (nam truc)) van ((hanh em) OR (hanh lam)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach van nang x hoi. hieu van ((cau truc) OR (nam truc)) van ((hanh em) OR (hanh lam)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach van nang x hoi. hieu van ((cau truc) or (nam truc)) van ((hanh em) OR (hanh lam)) cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach van nang x hoi. hieu van ((cau truc) or (nam truc)) van ((hanh em) OR (hanh lam)) cua triet*.