Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cau treo » cau theo, cau tren, cau triet
va thanh » gia thanh, ban thanh, le thanh
va tinh » may tinh
tu cach » tu cac
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va cau » van cau, va cac, va dau
ve cac » va cac, vien 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 (thuat sach)) ky tang xa hoi. hieu ve cac du ((va thanh) OR (va tinh)) va cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuat sach)) ky tang xa hoi. hieu ve cac du ((va thanh) OR (va tinh)) va cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuat sach)) ky tang xa hoi. hieu ve cac du ((va thanh) OR (va tinh)) va cau treo".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuat sach)) ky tang xa hoi. hieu ve cac du ((va thanh) OR (va tinh)) va cau treo*.