Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
tinh va » tich va, trinh van, trinh vat
sach ly » sach y, sach lo, sach ty
tinh da » tinh gia, tinh lao, tinh nam
va cam » va cham, va cao, va cai
luc va » duc va, tuc va, loc va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang mai hoi. hieu ((va cam) or (va cac)) luc va ((tinh da) OR (tinh va)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang mai hoi. hieu ((va cam) OR (va cac)) luc va ((tinh da) OR (tinh va)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang mai hoi. hieu ((va cam) or (va cac)) luc va ((tinh da) OR (tinh va)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang mai hoi. hieu ((va cam) or (va cac)) luc va ((tinh da) OR (tinh va)) va thiet*.