Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
tinh dai » trinh dai, tinh da, tinh hai
va triet » va thiet, va trien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va tinh » may tinh
ty nang » ky nang, ty hang, ly nang
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam

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) OR (ty xang)) mai hoi. hieu ve cam luc va tinh dai ((dua tren) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) mai hoi. hieu ve cam luc va tinh dai ((dua tren) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ty xang)) mai hoi. hieu ve cam luc va tinh dai ((dua tren) or (va triet))*".