Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
te sach » toc sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
duoc va » nuoc va, duoc ma, duong va
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach y, sach 2
dan vi » doan vi, don vi, dan va
v nang » va nang, vu nang, van nang

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 v nang ma hoi. hieu va che ((duoc va) or (duc va)) dan vi ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ma hoi. hieu va che ((duoc va) OR (duc va)) dan vi ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ma hoi. hieu va che ((duoc va) or (duc va)) dan vi ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ma hoi. hieu va che ((duoc va) or (duc va)) dan vi ((su triet) OR (ve triet))*.