Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van tien » toan tien, van hieu, van tuan
anh thai » anh thi, anh tai, tranh thai
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
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 (sang ma)) hoi. hieu va cac duc van ((anh thai) OR (nhanh thai)) van tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (sang ma)) hoi. hieu va cac duc van ((anh thai) OR (nhanh thai)) van tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (sang ma)) hoi. hieu va cac duc van ((anh thai) OR (nhanh thai)) van tien".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (sang ma)) hoi. hieu va cac duc van ((anh thai) OR (nhanh thai)) van tien*.