Perhaps you should try some spelling variations:
dinh tri » chinh tri
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
nam duc » nam duoc, pham duc, nam thuc
va dinh » van dinh, va kinh, va tinh
tri cau » tri cac, tri dau, trinh cau
te sai » te tai, te bai, te lai
sai ky » sac ky
ma hoi » mai hoi, ma hoa, me hoi
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ((ma hoi) OR (xa hoi)). hieu va nam duc va dinh tri cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang ((ma hoi) OR (xa hoi)). hieu va nam duc va dinh tri cau tren".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang ((ma hoi) OR (xa hoi)). hieu va nam duc va dinh tri cau tren*.