Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
thu sach » tu sach, thuat sach, thuoc sach
van cham » van tham, va cham, van pham
van chat » cao chat
luc luan » ly luan, tu luan
phan lap » phan dau
lap lam » cap lam, lam lam, lap lai
y xang » ty xang
xang x » nang x
x hoi » xa hoi, o hoi, x ho
viec » viet, vien

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 y xang x hoi. hieu ((van cham) OR (van chat)) luc luan phan lap lam viec~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y xang x hoi. hieu ((van cham) OR (van chat)) luc luan phan lap lam viec".
• Adding a wildcard symbol may retrieve word variants: thu sach y xang x hoi. hieu ((van cham) OR (van chat)) luc luan phan lap lam viec*.