Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
nang mai » nang ma, nang tai, lang mai
vien dai » hien dai
te sach » toc sach
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
xuc van » luc van, vuc van, xuc ban
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang

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 ly nang mai hoi. hieu vien dai ((xuc van) OR (duc van)) minh ((vai cuu) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang mai hoi. hieu vien dai ((xuc van) OR (duc van)) minh ((vai cuu) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang mai hoi. hieu vien dai ((xuc van) OR (duc van)) minh ((vai cuu) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang mai hoi. hieu vien dai ((xuc van) OR (duc van)) minh ((vai cuu) or (vai cua)) tre*.