Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
tinh te » kinh te, tinh tu, tinh he
va tinh » may tinh
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
te cua » tue cua, le cua, de cua
cua te » cua tu

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 ty nang xa hoi. ((hieu ve) OR (hieu va)) ((cham duc) or (pham duc)) va tinh te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu ve) OR (hieu va)) ((cham duc) OR (pham duc)) va tinh te cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu ve) OR (hieu va)) ((cham duc) or (pham duc)) va tinh te cua te*".