Perhaps you should try some spelling variations:
thai hoc » dai hoc, bai hoc, hoi hoc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va thai » van thai, va tai, va tham
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
te cac » tu cac, te cao, de cac
ve cac » va cac, vien cac
vi cua » di cua

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