Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
dan dai » dat dai, can dai, dan dat
va cau » van cau, va cac, va dau
va dan » ca dan, va dao, va dau
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((5 hoi) or (o hoi)). lieu va cau truc va dan dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((5 hoi) OR (o hoi)). lieu va cau truc va dan dai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((5 hoi) or (o hoi)). lieu va cau truc va dan dai cua te*.