Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
thai do » thay doi, thai den
va thai » van thai, va tai, va tham
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
te sac » te sach, te cac, te san
do va » do van, so va

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

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