Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
day thanh » dao thanh, dat thanh, da thanh
cau tren » cu tren, dau tren, ca tren
day manh » van manh, duc manh, ha manh
day hanh » day nhanh, dao hanh, da hanh
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
vu sach » vu bach, su sach, vu khach
di cau » da cau, diem cau
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 cham thuc ((((day hanh) or (day manh))) or (day thanh)) di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve cham thuc ((((day hanh) OR (day manh))) OR (day thanh)) di cau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve cham thuc ((((day hanh) or (day manh))) or (day thanh)) di cau tren*.