Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh via » hanh vi, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
va bao » va bai
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
bao bo » bac bo, ban bo, nao bo
bo va » bao va, do va, so va

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) or (v nang)) cao hoi. hieu va bao bo va hanh via ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) cao hoi. hieu va bao bo va hanh via ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) cao hoi. hieu va bao bo va hanh via ((cua tre) or (cau tren))*.