Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
va trien » va truyen, va thiet, va tuyen
sach thi » sach thu, sach tai, sach thieu
thanh ha » thanh hoa, thanh hai, nhanh ha
hieu van » hieu va, thien van, lieu va
hanh dam » hanh lam, hanh nam, hang dam
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, duc va
ha hoi » hoa hoi, ha noi, xa hoi

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 thanh ha hoi. hieu van cau ((tuc va) or (tuc xa)) ((hanh dam) OR (thanh dam)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi thanh ha hoi. hieu van cau ((tuc va) OR (tuc xa)) ((hanh dam) OR (thanh dam)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi thanh ha hoi. hieu van cau ((tuc va) or (tuc xa)) ((hanh dam) OR (thanh dam)) va trien".
• Adding a wildcard symbol may retrieve word variants: tu sach thi thanh ha hoi. hieu van cau ((tuc va) or (tuc xa)) ((hanh dam) OR (thanh dam)) va trien*.