Perhaps you should try some spelling variations:
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
tuc va » thuc va, tuc xa, duc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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