Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
kho tang » cao tang
cac thuc » cach thuc, cac thu, can thuc
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
te sach » toc sach
ve cac » va cac, vien cac
vi cua » vai cua, di cua
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: ((tu sach) or (te sach)) ((kho tang) or (ky dang)) xa hoi. hieu ve cac thuc day hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((kho tang) OR (ky dang)) xa hoi. hieu ve cac thuc day hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ((kho tang) or (ky dang)) xa hoi. hieu ve cac thuc day hanh vi cua te*.