Perhaps you should try some spelling variations:
quan thanh » ban thanh
van thanh » ban thanh, van tuan
cua tre » cua te, cuu tre, cua triet
san cua » sang cua, ban cua, dan cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
tang xa » trang xa, lang xa, tang ha
tang ma » mang may, tang van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam duc ((quan thanh) OR (van thanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((tang xa) OR (tang ma)) hoi. hieu ve cam duc ((quan thanh) OR (van thanh)) san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam duc ((quan thanh) OR (van thanh)) san cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam duc ((quan thanh) OR (van thanh)) san cua tre*.