Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hang » van khang, van hoang, van thang
nam thuc » nam thuoc, am thuc, nam tu
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
hang te » hang ke, hang tu, hang ve
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
te cua » tue cua, le cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky nang ma hoi. hieu ve ((nam thuc) OR (nam thu)) van hang te cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ma hoi. hieu ve ((nam thuc) OR (nam thu)) van hang te cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang ma hoi. hieu ve ((nam thuc) OR (nam thu)) van hang te cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ma hoi. hieu ve ((nam thuc) OR (nam thu)) van hang te cua triet*.