Perhaps you should try some spelling variations:
nuoc cac » duoc cac, luoc cac, nuoc cap
ban thai » ban than, ban thi, ban tai
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
dan thi » dang thi, tran thi, dinh thi
van dat » van dao, van dau, dan dat
nang xa » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van dat nuoc cac ((ban thai) or (dan thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van dat nuoc cac ((ban thai) OR (dan thi)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang x)) hoi. hieu van dat nuoc cac ((ban thai) or (dan thi)) cuu tre*".