Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, phan duc
tru nang » tra nang, tri nang, truc nano
pham duy » pham duc
su sach » so sach, vu sach
va chua » vua chua, ca chua, va chu
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu vu » hieu va, hieu ve, hieu su
tu nang » tu nong, tu nano, tu lang
chua te » cua te, chua tu, chua xe

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((tu nang) OR (tru nang)) xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh va chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tru nang)) xa hoi. hieu vu ((cham duc) OR (pham duy)) va tinh va chua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) OR (tru nang)) xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh va chua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) OR (tru nang)) xa hoi. hieu vu ((cham duc) or (pham duy)) va tinh va chua te*.