Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
nang mai » nang ma, nang tai, lang mai
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
luc va » tuc va, loc va
cua te » cua tu

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 mai hoi. hieu vien cac ((luc va) or (duc va)) thanh dai ((cua te) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang mai hoi. hieu vien cac ((luc va) OR (duc va)) thanh dai ((cua te) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang mai hoi. hieu vien cac ((luc va) or (duc va)) thanh dai ((cua te) or (cua triet))*.