Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
gian lan » gian lang, gian dan, giang van
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
va gian » va gianh, van gian, va giai
lan cua » lang cua, ban cua, lai cua
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang x hoi. ((hieu va) or (lieu va)) cam xuc va gian lan cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang x hoi. ((hieu va) OR (lieu va)) cam xuc va gian lan cua tu.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang x hoi. ((hieu va) or (lieu va)) cam xuc va gian lan cua tu*.