Perhaps you should try some spelling variations:
nuoc nhan » nuoc nhat, ngoc nhan, nhoc nhan
nhan hang » ngan hang, nhan dang, nha hang
dau tren » dau tien, dat tren, dau tieng
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cau tren » cu tren, ca tren, cau treo
hang ve » hang va, hanh ve, hang ke
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc nhan hang ve ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc nhan hang ve ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc nhan hang ve ((cau tren) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc nhan hang ve ((cau tren) or (dau tren))*.