Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
pham duy » pham duc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va lang » va nang, hoa lang
lang di » lang dai, hang di, lang du
ma hoi » mai hoi, xa hoi, ma hoa
di va » dai va, di vao, doi va
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu ve ((phan duc) OR (pham duy)) va lang di va thiet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu ve ((phan duc) or (pham duy)) va lang di va thiet*.