Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
cua chay » chua chay, cua cay, cua cha
thu sach » thuat sach, thuoc sach, thu hoach
nam thuc » nam thuoc, am thuc, nam thu
cam tuc » cam xuc, cam tu, dam thuc
dan cua » dan ca, ban cua, dai cua
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang co hoi. hieu ve ((cam tuc) OR (nam thuc)) va dan cua chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang co hoi. hieu ve ((cam tuc) OR (nam thuc)) va dan cua chay tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang co hoi. hieu ve ((cam tuc) OR (nam thuc)) va dan cua chay tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang co hoi. hieu ve ((cam tuc) OR (nam thuc)) va dan cua chay tren*.