Perhaps you should try some spelling variations:
phat tuu » phan tu, pham tu, phap tu
mang lai » mang lam, dang loai, trang lai
hieu su » hieu sau, tieu su, hieu so
va hanh » van hanh, va thanh, va danh
su phat » su pham, tu phat, xu phat
tu bai » tu ban, tu bat, te bai
tuu va » tu va, cuu va, tru va
bai ky » ban ky, sai ky, bac ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky ((mang lai) or (mang luoi)) hoi. hieu su phat tuu va hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky ((mang lai) OR (mang luoi)) hoi. hieu su phat tuu va hanh vi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky ((mang lai) or (mang luoi)) hoi. hieu su phat tuu va hanh vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu bai ky ((mang lai) or (mang luoi)) hoi. hieu su phat tuu va hanh vi ((cua te) OR (cua tu))*.