Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
cua tre » cua te, cua triet, dua tren
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
hieu ke » hieu kem, chieu ke, hieu ky
cuu tre » cau tren, cau treo
cao hoi » cau hoi, co hoi, cao hoc
sach v » sach va, sach y, sach vay
sach 2 » sach y
ke cau » ket cau

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 v) or (sach 2)) nang cao hoi. hieu ke cau luc van tuan le ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach v) OR (sach 2)) nang cao hoi. hieu ke cau luc van tuan le ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach v) or (sach 2)) nang cao hoi. hieu ke cau luc van tuan le ((cua tre) or (cuu tre))*.