Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac tro
hanh cac » hang cac, nhanh cay, hanh va
hanh cat » hanh luat, nhanh cay, hanh va
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu va ((cac tuc) or (cac thoi)) va ((hanh cat) OR (hanh cac)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu va ((cac tuc) OR (cac thoi)) va ((hanh cat) OR (hanh cac)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. hieu va ((cac tuc) or (cac thoi)) va ((hanh cat) OR (hanh cac)) cuu tre*".