Perhaps you should try some spelling variations:
phan tai » pham tai, han tai, phan tap
hieu van » hieu va, thien van, lieu va
phan thi » pham thi, tran thi, phan tu
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van cau duc van ((((phan tai) or (nhan tai))) or (phan thi)) cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cau duc van ((((phan tai) OR (nhan tai))) OR (phan thi)) cua cu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van cau duc van ((((phan tai) or (nhan tai))) or (phan thi)) cua cu*.