Perhaps you should try some spelling variations:
thai hoc » dai hoc, bai hoc, hoi hoc
cuu tre » cua tre, cau tren, cau treo
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
va thai » van thai, va tai, va tham
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te cao » te bao
vi cuu » vi luu, vinh cuu
te cac » tu cac, ve cac, de cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te cac) or (te cao)) ky lang xa hoi. hieu va thai hoc ((va hanh) OR (va danh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (te cao)) ky lang xa hoi. hieu va thai hoc ((va hanh) OR (va danh)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) or (te cao)) ky lang xa hoi. hieu va thai hoc ((va hanh) OR (va danh)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) or (te cao)) ky lang xa hoi. hieu va thai hoc ((va hanh) OR (va danh)) vi cuu tre*.