Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

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 sang ma hoi. hieu vien cac ((duc van) or (hoc dan)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang ma hoi. hieu vien cac ((duc van) OR (hoc dan)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ma hoi. hieu vien cac ((duc van) or (hoc dan)) hanh vi cuu tre*.