Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thi nang » thi cong, ki nang, thi hanh
hoa chat » hop chat, hoa phan
hoa xuat » hoa xa
cham luc » cham soc, nhan luc, cham cuu
sach thi » sach thu, sach tai, sach thieu
ham cua » pham cua, hai cua, nam cua
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi nang ma hoi. hieu va cham luc va thanh ((ham cua) or (((hoa xuat) or (hoa chat)))) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang ma hoi. hieu va cham luc va thanh ((ham cua) OR (((hoa xuat) OR (hoa chat)))) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang ma hoi. hieu va cham luc va thanh ((ham cua) or (((hoa xuat) or (hoa chat)))) viet*.