Perhaps you should try some spelling variations:
dua tren » dung tren
luat tuc » luat thue
cua tre » cua te, cua triet, cua thep
cuu tre » cau tren, cau treo
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
te sach » toc sach
va luat » va thuat, vay luan, cua luat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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 y nang ma hoi. hieu va luat tuc va tinh di ((cuu tre) or (((cua tre) OR (dua tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va luat tuc va tinh di ((cuu tre) OR (((cua tre) OR (dua tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va luat tuc va tinh di ((cuu tre) or (((cua tre) OR (dua tren))))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va luat tuc va tinh di ((cuu tre) or (((cua tre) OR (dua tren))))*.