Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
hieu van » thien van, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
luc va » duc va, tuc va, loc va
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang tai khoa. ((hieu van) or (hieu va)) cam luc va hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang tai khoa. ((hieu van) OR (hieu va)) cam luc va hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang tai khoa. ((hieu van) or (hieu va)) cam luc va hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang tai khoa. ((hieu van) or (hieu va)) cam luc va hanh ((vi cua) OR (vai cua)) tre*.