Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
lap cua » lai cua, tap cua, lam cua
so hai » son hai, su hai, so ha
o hai » co hai, o lai, _ hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang ((o hai) OR (so hai)). hieu van cac duc va thanh lap cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((o hai) OR (so hai)). hieu van cac duc va thanh lap cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ((o hai) OR (so hai)). hieu van cac duc va thanh lap cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((o hai) OR (so hai)). hieu van cac duc va thanh lap cua vat*.