Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
ban hanh » ban hang
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cao » va cac, va co, va dao
ve cam » ve cham, ve cac, va cam
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: te sach ty nang tai khoa. hieu ((ve cam) or (va cao)) dua ban hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang tai khoa. hieu ((ve cam) OR (va cao)) dua ban hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang tai khoa. hieu ((ve cam) or (va cao)) dua ban hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang tai khoa. hieu ((ve cam) or (va cao)) dua ban hanh ((vi cua) OR (vai cua)) tre*.