Perhaps you should try some spelling variations:
cham truc » nham thuc, pham thuc, nam truc
su triet » su viet, su tien, ve triet
phan dau » phan tu, hang dau
nang hoi » nang noi, nang hoc, nang ho
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu tu » chieu tu, hieu tuc, hien tu
hoi hoi » hoi hoc, hoc hoi, hoi doi
ty nang » ky nang, ty xang, ty hang

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 hoi hoi. hieu tu ((cham truc) OR (cau 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 hoi hoi. hieu tu ((cham truc) OR (cau 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 hoi hoi. hieu tu ((cham truc) OR (cau truc)) va ((phan lap) or (phan dau)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang hoi hoi. hieu tu ((cham truc) OR (cau truc)) va ((phan lap) or (phan dau)) su triet*.