Perhaps you should try some spelling variations:
tham hoc » thai hoc, tham hoa, than hoc
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
te cac » ve cac, te cao, de cac
vi cua » vai 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 (tu cac)) ky nang xa hoi. hieu va tham hoc ((va hanh) or (van hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (tu cac)) ky nang xa hoi. hieu va tham hoc ((va hanh) OR (van hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) OR (tu cac)) ky nang xa hoi. hieu va tham hoc ((va hanh) or (van hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) OR (tu cac)) ky nang xa hoi. hieu va tham hoc ((va hanh) or (van hanh)) vi cua tre*.