Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
cham duc » pham duc, cham soc, pham duy
lai chay » lai chau, lam chay, lai chang
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
tu cach » tu cac
va cham » va chat, va tham
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua

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 (thu sach)) ky tang xa hoi. hieu va cham duc ((va hanh) OR (van hanh)) lai chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky tang xa hoi. hieu va cham duc ((va hanh) OR (van hanh)) lai chay tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky tang xa hoi. hieu va cham duc ((va hanh) OR (van hanh)) lai chay tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky tang xa hoi. hieu va cham duc ((va hanh) OR (van hanh)) lai chay tren*.