Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
day nhanh » day thanh, duy nhanh, dac nhan
dao hanh » dao thanh, dang hanh, ban hanh
hieu van » hieu va, thien van, lieu va
doi cua » dai cua, hoi cua
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
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: vu sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham thuc ((dao hanh) OR (day nhanh)) doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham thuc ((dao hanh) OR (day nhanh)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. ((hieu ve) OR (hieu van)) cham thuc ((dao hanh) OR (day nhanh)) doi cua tre*.