Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
cham xuc » cam xuc, cham soc, pham duc
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
nang doc » nang luc
doc hoc » duoc hoc, toc hoc, duc hoc
sach ky » sach y, sach ty, sach kem
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau

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 ky) or (sac ky)) nang doc hoc. hieu van ((cham xuc) OR (chat xuc)) va danh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang doc hoc. hieu van ((cham xuc) OR (chat xuc)) va danh va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang doc hoc. hieu van ((cham xuc) OR (chat xuc)) va danh va cau tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang doc hoc. hieu van ((cham xuc) OR (chat xuc)) va danh va cau tren*.