Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
su sach » so sach
doi cua » dai cua, hoi cua, dong cua
hieu ve » hieu va, hieu van
vu sach » vu bach, vu khach
di cua » dai cua, de cua, do cua
ve cam » ve cham, ve cac, va cam
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) or (vu sach)) ky nang x hoi. hieu ve cam thuc day hanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu ve cam thuc day hanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. hieu ve cam thuc day hanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu ve cam thuc day hanh ((di cua) OR (doi cua)) tre*.