Perhaps you should try some spelling variations:
duc phan » dung phan, duc thang, duc phung
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam ((duc phan) or (suc manh)) hanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam ((duc phan) OR (suc manh)) hanh tai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam ((duc phan) or (suc manh)) hanh tai cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam ((duc phan) or (suc manh)) hanh tai cua viet*.