Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tu cach » tu cac
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (te sach)) ky tang xa hoi. hieu ((van lam) OR (van nam)) duc va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky tang xa hoi. hieu ((van lam) OR (van nam)) duc va hanh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (te sach)) ky tang xa hoi. hieu ((van lam) OR (van nam)) duc va hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky tang xa hoi. hieu ((van lam) OR (van nam)) duc va hanh ve cau tren*.