Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh tai » thanh tai, hang tai, han tai
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
so tien » su tien, so bien, do tien
va cam » va cham, va cac, va cao
so tin » ro tin

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach vu nang xa hoi. lieu va cam thuc day hanh tai ((so tien) OR (so tin))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach vu nang xa hoi. lieu va cam thuc day hanh tai ((so tien) OR (so tin))".
• Adding a wildcard symbol may retrieve word variants: thu sach vu nang xa hoi. lieu va cam thuc day hanh tai ((so tien) OR (so tin))*.