Perhaps you should try some spelling variations:
ve triet » va trien, su triet
dang mau » dong mau, dang van, dang su
tan anh » tuan anh, tran anh, toan anh
hoc sac » hoc sach, hoc cac, hoc mac
van cam » van lam, van cau, van dam
mau hoi » cau hoi, mai hoi, mau ho
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
anh vi » hanh vi, anh va, anh ve
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: hoc sac ky dang mau hoi. hieu ((van cam) OR (van nam)) duc tan anh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky dang mau hoi. hieu ((van cam) OR (van nam)) duc tan anh vi ((cua te) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky dang mau hoi. hieu ((van cam) OR (van nam)) duc tan anh vi ((cua te) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky dang mau hoi. hieu ((van cam) OR (van nam)) duc tan anh vi ((cua te) or (ve triet))*.