Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang mai » nang ma, nang tai, lang mai
nhan tai » hang tai, van tai, toan tai
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
han tai » hang tai, van tai, toan tai
te sach » toc sach
van cac » van hac, van cau, van bac
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
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: te sach ty nang mai hoi. hieu van cac ((xac va) or (duc va)) ((han tai) OR (nhan tai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang mai hoi. hieu van cac ((xac va) OR (duc va)) ((han tai) OR (nhan tai)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang mai hoi. hieu van cac ((xac va) or (duc va)) ((han tai) OR (nhan tai)) cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang mai hoi. hieu van cac ((xac va) or (duc va)) ((han tai) OR (nhan tai)) cau tren*.