Perhaps you should try some spelling variations:
duong thai » duong thi, duong tai, duong hai
dung thai » dung tai, dung hai, dung thi
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((x hoi) or (x ho)). hieu va cam tuc van ((dung thai) OR (duong thai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (x ho)). hieu va cam tuc van ((dung thai) OR (duong thai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (x ho)). hieu va cam tuc van ((dung thai) OR (duong thai)) su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (x ho)). hieu va cam tuc van ((dung thai) OR (duong thai)) su triet*.