Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
vu sach » vu bach, su sach, vu khach
ha hoi » hoa hoi, ha noi, xa hoi
vai su » va su, van su, tai su
ve am » va am

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 ha hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh ((vai su) OR (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang ha hoi. hieu ve am ((thuc dan) OR (thuc vat)) hanh ((vai su) OR (lai su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang ha hoi. hieu ve am ((thuc dan) or (thuc vat)) hanh ((vai su) OR (lai su)) triet*".