Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
cam thuc » am thuc, nam thuc, cam thu
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
va danh » va dinh, va dan, va hanh
van anh » van thanh, tuan anh, van minh
vi cua » vai cua, di cua

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 xa hoi. hieu qua cam thuc ((va danh) or (van anh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu qua cam thuc ((va danh) OR (van anh)) vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu qua cam thuc ((va danh) or (van anh)) vi cua triet*.