Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tai khoa » da khoa, noi khoa
cau treo » cau theo, cau triet, cau trieu
cham xuc » cam xuc, chat xuc, cham soc
mai khoi » mai khoa, cac khoi, dai khoa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, te sach
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh

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 ky nang ((mai khoi) OR (tai khoa)). hieu ve cham xuc va han tai ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai khoi) OR (tai khoa)). hieu ve cham xuc va han tai ((cau treo) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai khoi) OR (tai khoa)). hieu ve cham xuc va han tai ((cau treo) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai khoi) OR (tai khoa)). hieu ve cham xuc va han tai ((cau treo) or (cau tren))*.