Perhaps you should try some spelling variations:
phan tap » phan lap, han tap, pha tap
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tap cua » tap quan, tiep cua
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ve cam » ve cham, ve cac, va cam
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sach ky tang ma hoi. hieu ve cam ((luc va) or (tuc va)) phan tap cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoi. hieu ve cam ((luc va) OR (tuc va)) phan tap cua cu*.