Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va, hieu ve
dau tren » dau tien, dat tren, dau tieng
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
lam luc » lao luc, lam duoc
va kinh » va tinh, qua kinh
kinh di » kinh do, kinh i, minh di
luc va » duc va, tuc va, loc va
di dau » doi dau, bi dau, di du

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. ((((hieu van) OR (hieu va))) or (thi van)) lam luc va kinh di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. ((((hieu van) OR (hieu va))) OR (thi van)) lam luc va kinh di dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. ((((hieu van) OR (hieu va))) or (thi van)) lam luc va kinh di dau tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. ((((hieu van) OR (hieu va))) or (thi van)) lam luc va kinh di dau tren*.