Perhaps you should try some spelling variations:
dang mam » dang nam, dang mau, dang mat
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
dang ma » dang mau, dang mat, tang ma
hanh va » hang va, hanh vi
te sac » te sach, te cac, te san
va cua » va chua, via cua, ca cua
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
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: te sac ky ((dang ma) or (dang mam)) hoi. hieu ((ve cam) OR (ve cac)) thuc dan hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((dang ma) OR (dang mam)) hoi. hieu ((ve cam) OR (ve cac)) thuc dan hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((dang ma) or (dang mam)) hoi. hieu ((ve cam) OR (ve cac)) thuc dan hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((dang ma) or (dang mam)) hoi. hieu ((ve cam) OR (ve cac)) thuc dan hanh va cua te*.