Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
danh vai » danh sai, danh va, doanh van
cham xuc » chat xuc, cham soc, pham duc
hieu van » thien van, lieu va, hieu ve
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet

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 thu nang xa hoi. ((hieu va) or (hieu van)) ((cham xuc) or (cam xuc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. ((hieu va) OR (hieu van)) ((cham xuc) OR (cam xuc)) va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. ((hieu va) or (hieu van)) ((cham xuc) or (cam xuc)) va danh vai cua tre*.