Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » ban thanh, va tinh, le thanh
hau tren » dau tren, cau tren, thai tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
hai hau » hai chau, dai hau, hai hai
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang xa hoi. ((hieu va) OR (hieu qua)) pham duc ((va thanh) or (gia thanh)) hai hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. ((hieu va) OR (hieu qua)) pham duc ((va thanh) OR (gia thanh)) hai hau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. ((hieu va) OR (hieu qua)) pham duc ((va thanh) or (gia thanh)) hai hau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. ((hieu va) OR (hieu qua)) pham duc ((va thanh) or (gia thanh)) hai hau tren*.