Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
dai huu » dao huu, dai hau, dai thua
va hanh » van hanh, va danh, ban hanh
sach ty » sach y, sach tu, sach thu
cac xuc » cam xuc, cac nuoc, chat xuc
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
huu tri » huu tai
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((x hoi) OR (o hoi)). hieu va cac xuc ((va hanh) or (va thanh)) dai huu tri~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (o hoi)). hieu va cac xuc ((va hanh) OR (va thanh)) dai huu tri*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((x hoi) OR (o hoi)). hieu va cac xuc ((va hanh) or (va thanh)) dai huu tri*".