Perhaps you should try some spelling variations:
duc tren » duoc tren, dua tren, duc tien
nhan tai » hang tai, van tai, toan tai
tai duc » tai cuc, mai duc, tai du
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu ve » hieu va, hieu van
xac va » tac va, ac va, bac va

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 ((ty nang) or (ty hang)) mai hoi. hieu ve cham ((xac va) or (duc va)) nhan tai duc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) mai hoi. hieu ve cham ((xac va) OR (duc va)) nhan tai duc tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) mai hoi. hieu ve cham ((xac va) or (duc va)) nhan tai duc tren*.