Perhaps you should try some spelling variations:
day thanh » dao thanh, da thanh, dam thanh
dat thanh » dao thanh, dat khanh, dang thanh
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
ve cac » va cac, vien cac
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: ((su sach) or (te sach)) ky lang xa hoi. hieu ve cac thuc ((day thanh) OR (dat thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky lang xa hoi. hieu ve cac thuc ((day thanh) OR (dat thanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky lang xa hoi. hieu ve cac thuc ((day thanh) OR (dat thanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky lang xa hoi. hieu ve cac thuc ((day thanh) OR (dat thanh)) vi cua te*.