Perhaps you should try some spelling variations:
cua triet » su triet, va triet
duc phan » dung phan, duc thang, duc phung
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
han tai » hang tai, nhan tai, van tai
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: tu sach ty nang xa hoi. hieu ve cam ((duc phan) or (suc manh)) han tai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve cam ((duc phan) OR (suc manh)) han tai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve cam ((duc phan) or (suc manh)) han tai ((cua triet) or (cua viet))*.