Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
vat hanh » vat thanh, van hanh, va hanh
tham hoc » thai hoc, tham hoa, than hoc
hoc vat » hoc va, hoc viet, thuc vat
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te san » te ban, ke san, tu san
vi luu » vi lua
te sac » te sach, te cac

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) or (te san)) ky dang xa hoi. ((hieu van) or (hieu va)) tham hoc vat hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky dang xa hoi. ((hieu van) OR (hieu va)) tham hoc vat hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te san)) ky dang xa hoi. ((hieu van) or (hieu va)) tham hoc vat hanh vi luu tre*.