Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
thanh hai » thanh phan, thanh hoa, thanh san
hoc sach » hoc sinh, hoc cac, hoc anh
duc tang » duc thang, tuc tang, duc tung
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cao » va cao, ve bao, ve cac
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (hoc sach)) ty nang xa hoi. hieu ve cao ((duc tang) or (duc tan)) thanh hai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang xa hoi. hieu ve cao ((duc tang) OR (duc tan)) thanh hai cua su.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) ty nang xa hoi. hieu ve cao ((duc tang) or (duc tan)) thanh hai cua su*.