Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh vi » hanh vi, thanh va, thanh ve
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vi cuu » vi luu, vinh cuu
he na » he nam, he xa, he va

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 (thu hoach)) ky lang xa hoi. hieu ((he na) OR (he sna)) thuc day thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu hoach)) ky lang xa hoi. hieu ((he na) OR (he sna)) thuc day thanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu hoach)) ky lang xa hoi. hieu ((he na) OR (he sna)) thuc day thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ky lang xa hoi. hieu ((he na) OR (he sna)) thuc day thanh vi cuu tre*.