Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thu sach » thuat sach, thuoc sach, thu hoach
ban hang » ngan hang
cham xuc » chat xuc, cham soc, pham duc
hang di » hang doi, hang vi, hang dien
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
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: ((tu sach) OR (thu sach)) va nang xa hoi. hieu ve ((cham xuc) or (cam xuc)) ban hang di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) va nang xa hoi. hieu ve ((cham xuc) OR (cam xuc)) ban hang di dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) va nang xa hoi. hieu ve ((cham xuc) or (cam xuc)) ban hang di dau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) va nang xa hoi. hieu ve ((cham xuc) or (cam xuc)) ban hang di dau tren*.