Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
phuc va » phuc vu, thuc va, chuc va
ca tren » cau tren, cu tren, la tren
ve cau » va cau, ve cac, le cau
ke cau » ket cau
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va ca » va cac, va cao, va cai

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 xa hoi. hieu ((ve cau) OR (ke cau)) phuc va dan va ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu ((ve cau) OR (ke cau)) phuc va dan va ca tren".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ((ve cau) OR (ke cau)) phuc va dan va ca tren*.