Perhaps you should try some spelling variations:
giao thanh » gia thanh, gian thanh, giay thanh
cham hoc » cham soc, chat hoc, cham hoi
cau tren » dau tren, ca tren, cau treo
thanh di » thanh doi, thanh de, thanh do
hoc giao » hoc cao
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cu tren » tu tren, dua tren

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. ((hieu ve) OR (lieu va)) cham hoc giao thanh di ((cau tren) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu ve) or (lieu va)) cham hoc giao thanh di ((cau tren) OR (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. ((hieu ve) or (lieu va)) cham hoc giao thanh di ((cau tren) OR (cu tren))*.