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

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

• Performing a fuzzy search may retrieve terms with similar spellings: te lai ky nang ((ma hoi) or (xa hoi)). hieu va ((nam duc) OR (nam duoc)) va dinh tri cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te lai ky nang ((ma hoi) OR (xa hoi)). hieu va ((nam duc) OR (nam duoc)) va dinh tri cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te lai ky nang ((ma hoi) or (xa hoi)). hieu va ((nam duc) OR (nam duoc)) va dinh tri cau tren".
• Adding a wildcard symbol may retrieve word variants: te lai ky nang ((ma hoi) or (xa hoi)). hieu va ((nam duc) OR (nam duoc)) va dinh tri cau tren*.