Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, thanh ca
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
tai hoi » tai khoi, dai hoi, tai hai
nam luc » nang luc, nhan luc, nam duoc
cac cua » cach cua, cac qua, ca cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang tai hoi. hieu van ((nam luc) or (nam thuc)) va thanh cac cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang tai hoi. hieu van ((nam luc) OR (nam thuc)) va thanh cac cua cu.
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang tai hoi. hieu van ((nam luc) or (nam thuc)) va thanh cac cua cu*.