Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
va triet » va thiet, va trien, ve triet
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hanh lam » hanh kem, hanh va, dinh lam
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
luc va » duc va, tuc va, loc va
ve cau » ke cau, ve cac, le cau
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hanh xa hoi. hieu ((ve cau) OR (va cau)) luc va ((hanh lam) or (thanh lap)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ((ve cau) OR (va cau)) luc va ((hanh lam) OR (thanh lap)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. hieu ((ve cau) OR (va cau)) luc va ((hanh lam) or (thanh lap)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ((ve cau) OR (va cau)) luc va ((hanh lam) or (thanh lap)) va triet*.