Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
su sach » so sach
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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) OR (vu sach)) ((y nang) or (v nang)) xa hoi. hieu van cam tuc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ((y nang) OR (v nang)) xa hoi. hieu van cam tuc va thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ((y nang) or (v nang)) xa hoi. hieu van cam tuc va thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ((y nang) or (v nang)) xa hoi. hieu van cam tuc va thanh va cua tre*.