Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh lap » thanh san, phan lap, thanh van
ve triet » va trien, su triet
sach thi » sach thu, sach tai, sach thieu
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
hanh va » hang va, hanh vi
hanh ma » hanh mau, hanh may, anh ma
qua cam » qua cham, qua cac, qua ca
tuc va » thuc va, truc va, tuc xa

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

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