Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
tai khoi » tai khoa, mai khoi, tao khoi
su sach » so sach, vu sach
dat cua » dai cua, day cua, mat cua
thuc va » thuc dan, thuc day
vi tham » vi pham, va tham, vi than
hieu vi » hieu voi, hieu va, hieu ve
tai hoi » dai hoi, tai hai, tai hoe
y nang » ky nang, ly nang, v nang
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: su sach y nang ((tai hoi) or (tai khoi)). hieu vi tham ((thuc va) OR (thuc vat)) thanh dat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((tai hoi) OR (tai khoi)). hieu vi tham ((thuc va) OR (thuc vat)) thanh dat cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((tai hoi) or (tai khoi)). hieu vi tham ((thuc va) OR (thuc vat)) thanh dat cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((tai hoi) or (tai khoi)). hieu vi tham ((thuc va) OR (thuc vat)) thanh dat cua te*.