Perhaps you should try some spelling variations:
dung thai » duong thai, dung tai, dung hai
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
van dung » van dong, xay dung, tin dung
thai cua » than cua, tai cuc, tri cua
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, dam thuc
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) OR (nam thuc)) van dung thai cua 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) OR (nam thuc)) van dung thai cua 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) OR (nam thuc)) van dung thai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (x ho)). hieu va ((cam tuc) OR (nam thuc)) van dung thai cua triet*.