Perhaps you should try some spelling variations:
thai tuc » thai thuc, thai thuy, thai hoc
van thai » van thoai, van tai, van hai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
sach ky » sach y, sach ty, sach kem
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky

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 ky) or (sac ky)) nang xa hoi. hieu van thai tuc va tinh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang xa hoi. hieu van thai tuc va tinh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang xa hoi. hieu van thai tuc va tinh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang xa hoi. hieu van thai tuc va tinh vi ((cua tre) OR (cuu tre))*.