Perhaps you should try some spelling variations:
thai tuc » thai thuc, thai thuy, thai hoc
hieu van » hieu va, thien van, lieu va
van thai » van thoai, van tai, van hai
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, mang xa
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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