Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
hieu van » hieu va, thien van, hieu ve
dong cua » dung cua, cong cua, huong cua
va thanh » gia thanh, ban thanh, va tinh
cau loc » hau loc, cau hoc, cau luc
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
loc va » hoc va, luc va
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang ma)) hoi. ((hieu van) or (lieu va)) cau loc va thanh dong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. ((hieu van) OR (lieu va)) cau loc va thanh dong cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang ma)) hoi. ((hieu van) or (lieu va)) cau loc va thanh dong cua tre*.