Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
phan dau » phan tu, hang dau
su triet » su viet, su tien, ve triet
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
truc va » thuc va, thuc vat, trung va
ty nang » ty xang, ty hang, ly nang
tu sach » thu sach, su sach, te sach

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) OR (ky nang)) hoi hoi. hieu tu cham truc va ((phan lap) or (phan dau)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) hoi hoi. hieu tu cham truc va ((phan lap) OR (phan dau)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ky nang)) hoi hoi. hieu tu cham truc va ((phan lap) or (phan dau)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ky nang)) hoi hoi. hieu tu cham truc va ((phan lap) or (phan dau)) su triet*.