Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang hoc » nang doc, nang luc, dong hoc
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
xuc va » duc va, tuc va, luc va
ve cau » ke cau, va cau, le cau
ve cac » vien cac

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 ty ((nang hoc) or (nang cao)) hoi. hieu ((ve cac) or (va cac)) xuc va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang hoc) OR (nang cao)) hoi. hieu ((ve cac) OR (va cac)) xuc va hanh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang hoc) or (nang cao)) hoi. hieu ((ve cac) or (va cac)) xuc va hanh ve cau tren*.