Perhaps you should try some spelling variations:
sach tham » sach nha
trong van » trong cac
pham duy » pham duc
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, cach thuc
qua pham » quan pham, quy pham, qua cham
vai cua » dai cua, hai cua, lai cua
duy van » duy vat, dung van
van hoi » van hoa, van hoc, van hoe
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach thu) or (sach tham)) trong van hoi. hieu qua pham duy van hanh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach tham)) trong van hoi. hieu qua pham duy van hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thu) or (sach tham)) trong van hoi. hieu qua pham duy van hanh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) or (sach tham)) trong van hoi. hieu qua pham duy van hanh ((vi cua) OR (vai cua)) te*.