Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
truc van » truc va, truc ban, truc dan
thuc van » thuc vat, thuc dan, thuc va
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
doi cuu » doi cua, doi cuoc
cuu tre » cua tre, cau tren, cau treo
va cau » van cau, va cac, va dau

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 ((ly nang) or (ty xang)) xa hoi. lieu va cau ((truc van) OR (thuc van)) thanh doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ty xang)) xa hoi. lieu va cau ((truc van) OR (thuc van)) thanh doi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ty xang)) xa hoi. lieu va cau ((truc van) OR (thuc van)) thanh doi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ty xang)) xa hoi. lieu va cau ((truc van) OR (thuc van)) thanh doi cuu tre*.