Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
pham duy » pham duc
tu sach » su sach, te sach, tu cach
ve pham » vi pham, v pham, ve phan
vai cua » hai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
duy va » duy vat, duy van, day va

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) OR (thu sach)) ty nang xa hoi. hieu ve pham duy va hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang xa hoi. hieu ve pham duy va hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang xa hoi. hieu ve pham duy va hanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang xa hoi. hieu ve pham duy va hanh ((vai cua) or (dai cua)) tre*.