Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
hieu vien » hieu hien, hieu viec, thieu nien
thanh te » thanh ve, thanh de, thanh le
ha thanh » va thanh, pham thanh, phan thanh
vien cac » vien bach, vien dai, vien da
ve triet » va trien, su triet
cac tac » cac toc, cac bac, cac dac
ty nang » ky nang, ty xang, ty hang
tac ha » bac ha, tac da, tac xa
o hoi » co hoi, o hoc, o hoa
te ve » te va, te vi, de ve
o hai » co hai, so hai, o lai

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 (thuat sach)) ty nang ((o hoi) or (o hai)). hieu vien cac tac ha thanh te ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ty nang ((o hoi) OR (o hai)). hieu vien cac tac ha thanh te ve triet.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ty nang ((o hoi) or (o hai)). hieu vien cac tac ha thanh te ve triet*.