Perhaps you should try some spelling variations:
trong van » trong cac
nam thuc » nam thuoc, am thuc, nam thu
tang dan » tang van, tung dan, tang luan
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
hieu vu » hieu va, hieu ve, hieu su
cam tuc » cam xuc, cam tu, dam thuc
va hanh » van hanh, va thanh, va danh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((tang dan) or (trong van)) hoi. hieu vu ((cam tuc) OR (nam thuc)) va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((tang dan) OR (trong van)) hoi. hieu vu ((cam tuc) OR (nam thuc)) va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((tang dan) or (trong van)) hoi. hieu vu ((cam tuc) OR (nam thuc)) va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((tang dan) or (trong van)) hoi. hieu vu ((cam tuc) OR (nam thuc)) va hanh vai cua te*.