Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
thuc dan » thuc hanh, thuc vat
nang xa » lang xa, nang ma, mang xa
hieu he » hieu ve, hiem he, hieu le
vu sac » vu sach, vu san, va sac
vi cua » vai cua, di cua
he nam » ha nam, nghe nam
sac ky » cac ky, sai 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: vu sac ky ((nang xa) or (nang x)) hoi. hieu he nam ((thuc dan) OR (hoc dan)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang xa) OR (nang x)) hoi. hieu he nam ((thuc dan) OR (hoc dan)) thanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((nang xa) or (nang x)) hoi. hieu he nam ((thuc dan) OR (hoc dan)) thanh vi cua te*".