Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
luu van » luan van, luu hanh
cua duc » cua tuc, cua nuoc, cua quoc
tuan vi » quan vi, luan vi, quans vi
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cua tu » cua tuc, cua su, cua cu

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 v nang mai hoi. hieu va cham ((luu van) OR (cuu van)) tuan vi ((cua duc) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang mai hoi. hieu va cham ((luu van) OR (cuu van)) tuan vi ((cua duc) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang mai hoi. hieu va cham ((luu van) OR (cuu van)) tuan vi ((cua duc) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang mai hoi. hieu va cham ((luu van) OR (cuu van)) tuan vi ((cua duc) or (cua tu))*.