Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
su sach » so sach, vu sach
tinh va » tich va, trinh vat, tinh gia
chua te » cua te, chua tu, chua xe
sach tu » sach thu, cach tu, sach ty
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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