Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thai cua » than cua, tai cuc, tri cua
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ve cam thuc ((va hanh) OR (va thanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) thai cua tre*.