Perhaps you should try some spelling variations:
hanh cat » hanh cac, hanh luat, nhanh cay
hieu cua » hieu qua, dieu cua, bieu cua
tu sach » thu sach, su sach, te sach
cac tac » cac toc, cac bac, cac dac
hanh ca » hanh cac, hanh cua, hanh cad
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
cac tuc » cac toc, cac tu, cac nuoc
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 cua ((cac tuc) OR (cac tac)) va ((hanh ca) or (hanh cat)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu cua ((cac tuc) OR (cac tac)) va ((hanh ca) OR (hanh cat)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. hieu cua ((cac tuc) OR (cac tac)) va ((hanh ca) or (hanh cat)) cuu tre*".