Perhaps you should try some spelling variations:
dong thai » duong thai, dong tai, cong thai
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cua triet, dua tren
xa dong » ha dong, van dong, lao dong
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
su cao » cu cao, vu cao, su co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cao ky ((nang xa) OR (nang ma)) hoi. hieu van cam tuc xa dong thai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cao ky ((nang xa) OR (nang ma)) hoi. hieu van cam tuc xa dong thai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cao ky ((nang xa) OR (nang ma)) hoi. hieu van cam tuc xa dong thai ((cua tre) or (cuu tre))*".