Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vat hanh » vat thanh, van hanh, va hanh
cam thuc » am thuc, nam thuc, cam thu
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang x hoi. hieu ve cam thuc ((((vat hanh) or (ban thanh))) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x hoi. hieu ve cam thuc ((((vat hanh) OR (ban thanh))) OR (va danh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x hoi. hieu ve cam thuc ((((vat hanh) or (ban thanh))) or (va danh)) di cua tre*.