Perhaps you should try some spelling variations:
thai tuc » thai thuc, thai thuy, thai hoc
su sach » so sach
vu sach » vu bach, vu khach
hieu va » lieu va, hieu qua
va thai » van thai, va tai, va tham
xa dinh » xac dinh, va dinh, ba dinh
vi cuu » vinh cuu
vi luu » vi lua

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 x ho. hieu va thai tuc xa dinh ((vi cuu) or (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x ho. hieu va thai tuc xa dinh ((vi cuu) OR (vi luu)) tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x ho. hieu va thai tuc xa dinh ((vi cuu) or (vi luu)) tre*.