Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va
vai su » va su, van su, lai su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) am ((thuc dan) or (thuc vat)) hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) am ((thuc dan) OR (thuc vat)) hanh vai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang xa hoi. ((hieu va) OR (hieu qua)) am ((thuc dan) or (thuc vat)) hanh vai su triet*".