Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
dieu cua » dieu tra
giau cua » gian cua, gia cua, bieu cua
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
va dan » ca dan, va dao, va dau

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 ty tang xa hoi. hieu vu cham duc ((van hanh) or (va dan)) ((giau cua) OR (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. hieu vu cham duc ((van hanh) OR (va dan)) ((giau cua) OR (dieu cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty tang xa hoi. hieu vu cham duc ((van hanh) or (va dan)) ((giau cua) OR (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. hieu vu cham duc ((van hanh) or (va dan)) ((giau cua) OR (dieu cua)) te*.