Perhaps you should try some spelling variations:
chua tri » chu tri, chua trieu, chua tivi
chua tre » cua tre, chua trieu, cho tre
thanh va » thanh van, hanh va, thanh ha
xa thanh » va thanh, ha thanh, ta thanh
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
nang xa » nang x, lang xa, mang xa
su sach » so sach, vu sach

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 ty ((nang xa) or (nang ma)) hoi. hieu van cau tuc xa thanh va ((chua tre) or (chua tri))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. hieu van cau tuc xa thanh va ((chua tre) OR (chua tri)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang ma)) hoi. hieu van cau tuc xa thanh va ((chua tre) or (chua tri))*.