Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
cam thuc » am thuc, nam thuc, cam thu
dao hanh » dao thanh, dang hanh, ban hanh
dua tren » dung tren
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
cua te » cua tu

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 ho. hieu va cam thuc ((dao hanh) or (day thanh)) di ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu va cam thuc ((dao hanh) OR (day thanh)) di ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va cam thuc ((dao hanh) or (day thanh)) di ((dua tren) or (cua te))*.